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Ancillary K9 Dog Training

Denver, Colorado

4.9/5· 184 Google reviews

About Ancillary K9 Dog Training

Ancillary K9, Denver's premier dog behavior expert, transforms challenging behaviors with personalized, intensive training. Our certified trainers address aggression, anxiety, and obedience issues. Clients see rapid, lasting results, often within six sessions. Our programs empower you and your dog for long-term success. With our Lifetime Training Assurance, we guarantee free retraining if your dog regresses. Offering private training and 24/7 support, we help rebuild harmonious relationships.

Training & services

Training goals

  • Behavior consultation
    Program details

    Expert training to address unwanted behaviors such as anxiety, reactivity, or aggression. We create customized plans to correct issues, build positive habits, and improve your dog's overall behavior, ensuring a happier and more balanced companion.

    Comprehensive training designed to address complex behavioral issues such as anxiety, reactivity, and aggression. Tailored to your dog's unique needs, this program focuses on lasting solutions for a well-balanced and well-behaved companion.

    Effective behavioral modification for dogs with anxiety, fear, reactivity, or other challenges. We address root causes and help dogs become confident and calm, providing solutions for behavioral problems with customized training in Denver.

  • Leash training
    Program details
  • Obedience training
    Program details

    Professional dog obedience training to teach essential commands, improve manners, and build a solid foundation for behavior. Ideal for dogs of all ages, ensuring they are well-behaved at home and in public. Serving Denver and nearby areas.

  • Puppy training
    Program details

    Trusted puppy training in Denver to build confidence and teach basic commands. We guide your puppy through early learning stages for better behavior, social skills, and obedience. Perfect for new dog owners in the Denver area.

  • Socialization
    Program details

Behavior support

  • Aggression training
    Program details

    Specialized training to address aggression toward people or other dogs. We identify root causes and use proven techniques to build trust, improve behavior, and ensure safety. Tailored for lasting results and a stronger bond with your dog.

    Specialized aggressive dog behavior training to reduce reactivity and manage aggression. Our expert trainers help your dog overcome triggers and develop safer responses. Ideal for dogs showing aggression toward people or other dogs.

  • Fear and confidence
    Program details
  • Reactivity training
    Program details

    Fast, effective reactive dog training in Denver for dogs that bark, lunge, growl, or struggle around other dogs and people. Practical training that gives you and your dog confidence and peace of mind.

  • Resource guarding
    Program details
  • Separation anxiety
    Program details

How training happens

  • Board and train
    Program details
  • Group classes
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  • Owner coaching Customer-reported
    Program details
  • Private training
    Program details

    One-on-one private dog training tailored to meet your dog's unique needs. Focus on obedience, behavioral issues, or aggression with customized sessions designed for faster results. Serving Denver with personalized, professional dog training solutions.

Dog age

  • Puppies
    Program details

Support between sessions

  • Homework and practice Customer-reported
    Program details
  • Personalized training plans
    Program details

Assistance and working dogs

  • Protection training
    Program details

    Protection dog training in Denver focused on control, obedience, confidence, and reliable behavior. Training is tailored to the individual dog, owner, and their goals.

Dog size

  • Large dogs Customer-reported
    Program details

Your dog’s background

  • Rescue dogs
    Program details

    Dog training in Denver for rescue dogs adjusting to a new home or dealing with fear, anxiety, reactivity, or behavioral issues. We help build the bond between you and your dog.

Consultations

  • Free consultation
    Program details

Other listed services

View 29 additional details
  • Dog training
    Program details

    Professional dog training to improve obedience, resolve behavioral issues, and reduce aggression. Tailored training programs for dogs of all ages and breeds, designed to achieve quick, lasting results. Serving Denver and nearby areas.

  • Aggressive Behaviors
    Program details
  • Basic Commands
    Program details
  • Behavioral Evaluations
    Program details
  • Behavioral Program
    Program details
  • Canine Rehabilitation
    Program details
  • Court-ordered dog training
    Program details

    Court-ordered dog behavior training for legal compliance. Our training includes professional, detailed reports to meet court requirements. Available for Denver pet owners needing a thorough rebuilding of their dog's behavior.

  • Dog Behavior Assessments
    Program details
  • Dog Bites
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  • Dog Evaluations
    Program details
  • Dog Park
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  • Dog Starts
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  • Dog Trainers Schedule
    Program details
  • Dog behaviorist
    Program details

    Dog behaviorist specializing in solving behavioral issues like anxiety, fear, aggression, and reactivity. We provide tailored, humane behavior solutions to help dogs thrive in any environment. Serving Denver and surrounding areas.

  • Dog's Barks
    Program details
  • Dogs Treats
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  • Family Dogs
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  • Guard Dogs
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  • Obstacle Courses
    Program details
  • Off-leash dog training
    Program details

    Expert off-leash dog training to ensure your dog listens reliably, even without a leash. We focus on building recall, focus, and responsiveness, providing the freedom to explore while staying under control. Serving Denver and nearby areas.

  • Shelter Dog
    Program details
  • Dog Temperament Assessment
    Program details
  • Dog Temperament Test
    Program details
  • Working Dog Training
    Program details
  • Dog Anxiety Training
    Program details

    Trusted dog training for anxious. We work on building confidence, creating structure, and transforming your dog's behavior.

  • Seperation Anxiety Dog Training
    Program details

    Separation anxiety dog training in Denver for dogs that struggle when left alone. We’ll build a practical training plan to help your dog become confident and independent.

  • Destructive Dog Training
    Program details

    Dog training for destructive behaviors like chewing and damaging the home. We’ll help your dog building better habits, boundaries, and structure.

  • Dog Expert Witness
    Program details

    Expert witness services for dog-related legal matters. Professional insight into canine behavior, temperament, aggression risk, and other issues in legal cases.

  • Dog Behavior Consulting for Legal Matters
    Program details

    Professional dog behavior consulting for legal matters. Experienced insight into canine behavior, aggression risk, evaluations, and other factors relevant to legal cases.

Confirm current programs and availability directly.

Questions & answers

From Google

What people have asked about this business.

Do you offer protection dog training?

Hi there! Yes, we offer Colorado's most trusted Protection Dog Training. We'll provide an assessment to ensure your dog is right for the role. Then we'll embark on a training journey that transforms your companion into a protection dog, and you into a strong handler. Please get in touch if you have more questions!

Community answer · Ancillary K9 Dog Training · 2025-12-21

Question on Google
Are there certain breeds that your dog training works best with?

Hi there! Though we have extensive knowledge and experience with Schutzhund and working breeds, our training is designed to work for any breed of dog. All breeds of dogs can have behavioral and aggression issues, and our training is equipped to tackle them all. If you have more questions, please get in touch!

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
I'm struggling with a dog with serious behavior issues. Training in the past hasnt worked. Do you have any guarantees for your training?

Hi there! We specialize in hard to train or "problem dogs." Training is possible, even if other programs haven’t worked in the past. We are experts in dog behavior & obedience, and we guarantee fast, drastic changes in your dog. All of our programs come with Our Lifetime Support Guarantee, which is our promise to stand by you and your dog until your goals are achieved, as well as offering re-training if necessary.

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
Do you offer puppy training? I have a puppy that's already starting to show some aggression and is proving hard to train.

Yes, we offer trusted puppy training. We correct your puppy's behavior fast, ensuring they have the best start at life. Correcting their behavior when they're young is the best way to see them grow to be a well-adjusted and happy adult dog. We'd love to help you tackle their behavior issues. Get in touch to get started!

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
Do you only offer private dog training?

Private dog training offers tailored attention for specific behaviors and learning styles. It allows for flexible scheduling and results in faster progress. Our sessions are ideal for addressing unique issues, reducing distractions, ensuring a safe environment, and meeting individual goals. Owners receive immediate feedback and benefit from a private, relaxed setting, making it a preferred choice over group or board and train programs.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What training methods do you use?

In our training approach, we draw from the same methodologies used by law enforcement, military dog handlers, top sport dog trainers, and world-class competitors. Our methods are dynamic and are tailored to fit each unique situation. The tools and strategies we use hinge on the specific behaviors you want to address, your dog's individual temperament, and your proficiency and comfort as a handler. Our goal is effective, holistic training.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you handle training for court-ordered behavioral assessments?

Yes, we are well-equipped to handle court-ordered dog training and behavioral assessments. We understand the seriousness and sensitivity of these cases. Our team is able to provide comprehensive evaluations and design tailored training programs to address specific behavioral concerns. We're here to assist and ensure that both you and your dog navigate this process effectively. Please reach out to us to discuss your needs and learn more about how we can help.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you train aggressive dogs?

Yes, we have extensive experienced in addressing canine aggression. Whether it's biting, growling, or other aggressive behaviors, we employ evidence-based techniques to manage and reduce these behaviors. We understand that aggression can stem from various underlying causes, and our approach is both compassionate and tailored to each dog's individual needs. Our goal is to ensure safety and foster healthy dog-owner relationships.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you offer puppy training?

Yes, we absolutely offer puppy training! Starting early is key to a well-behaved adult dog. We recommend starting training for puppies once they reach 16 weeks of age and have been fully vaccinated against parvovirus. This ensures their safety while they embark on their training journey. Our puppy programs are tailored to the unique needs of young dogs, laying a strong foundation for future training. For a comprehensive overview, please visit our website.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What areas do you serve?

While our primary base is in the heart of Denver, our reputation has traveled well beyond city limits. In fact, we've had the privilege of working with passionate dog owners from as far as Vail and Aspen. This expansive reach underscores our commitment to excellence and the trust clients place in our services. Regardless of distance, we remain dedicated to providing premier dog training to help build stronger bonds between owners and their dogs.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What do you do to ensure your clients’ successes?

At the heart of our service, client success is paramount. We employ a diverse range of techniques and tools, ensuring each client benefits from the most effective and tailored training. Recognizing that questions and challenges arise, we provide unlimited phone, text, and email support between lessons, ensuring continuity in your dog's progress. Moreover, our commitment to you is unwavering, backed by our Lifetime Support Guarantee.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you charge for help between lessons?

We do not! We believe in providing holistic support throughout your training journey. Not only do we NOT charge for assistance between lessons, but we also prioritize open communication. To encourage this, we give all our clients direct access to their trainer's personal contact details. This ensures 24/7 availability for phone, text, and email support. We're committed to standing by you every step of the way.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What is your policy if I am not happy with the training?

We operate on a mutual commitment principle. If you're fully engaged—attending sessions, asking questions, and completing homework—we'll match your dedication. Your input reflects the support you receive. While we're eager to help, progress requires joint effort. If you're fully committed, we'll stand by you and your dog until you achieve the goals you're aiming for.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google

Public community answers. Authors are not verified as business representatives; details may have changed.

Customer reviews

Google listing
4.9
out of 5184 Google reviews

Mentioned in reviews

  • reactive dog training 26
  • confidence building 23
  • aggressive dog training 16
  • understanding dog behavior 16
  • leash pulling 15
  • obedience training 14
All 10 topics
  • ecollar training 9
  • flexible scheduling 6
  • fearful dog training 3
  • prong collar training 2

Google review topics, not confirmed services.

100 collected reviews

Text reviews first · newest first
Emily Ross
5/5
My hyper active dog is 11 and after trying many different trainers in his younger years and having a trainer tell me he was un-trainable I had given up on being able to take him out of my house with out him having a full meltdown. My sister found Dion for her dog aggressive dog a…Read full reviewClose full review

My hyper active dog is 11 and after trying many different trainers in his younger years and having a trainer tell me he was un-trainable I had given up on being able to take him out of my house with out him having a full meltdown. My sister found Dion for her dog aggressive dog and after seeing her results she talked me into doing an evaluation with Dion. I’ll be honest that I was hesitant but willing to give it a shot. After our sessions, this is the first time in my dogs life that I’ve been able to take him places with confidence. Thank you Dion for giving us tools that actually work for his brain!

Miriam Akselrod
5/5
I have two medium dogs one 8M and one 2.5F. The male was always dog reactive and the female is very anxious and nervous. She also would start fights with the male and I spent thousands at the vet repairing their wounds. Additionally, I couldn't walk them together as they were ver…Read full reviewClose full review

I have two medium dogs one 8M and one 2.5F. The male was always dog reactive and the female is very anxious and nervous. She also would start fights with the male and I spent thousands at the vet repairing their wounds. Additionally, I couldn't walk them together as they were very difficult to control. After a bad fight in April, I contacted Ancillary K9 and Dion agreed to train both dogs over 8 sessions. He made me read this book, the Good Dog Way Pt 2 and I never felt so much like a dog parent failure, as I saw myself in the book as the super permissive dog parent. It was really eye opening and motivated me even more to not just train my dogs but myself. I just completed my 7th session and it is night and day! I can walk my dogs together and when they see another dog on the other side of the street they aren't immediately freaking out. I even get asked if I'm a dog trainer! Lol! But if you don't put in the time to train your dog, building the basics and reinforcing the trainings that Dion provides, you probably won't be successful. But if you do, Dion gives you the tools, encouragement, and support to change your dog's life and your own at the same time. I used to walk 2 hours each day and now that I can handle them together, I have essentially gained a free hour out of my day!! I now know how to recognize when the female is at the edge and can calm her down. She tried to start a fight w the male a few weeks ago, but I was able to stop her immediately and we went on with our walk. That was empowering.

Chantel Montoya
5/5
If I could give Dion at K9 Ancillary more than 5 stars, I absolutely would. When we first came to him, our Staffordshire Terrier had a very difficult past. He had a serious Grade 3 bite history and significant trauma from a previous owner, and we suspect he may have even been us…Read full reviewClose full review

If I could give Dion at K9 Ancillary more than 5 stars, I absolutely would. When we first came to him, our Staffordshire Terrier had a very difficult past. He had a serious Grade 3 bite history and significant trauma from a previous owner, and we suspect he may have even been used in dog fighting. We were overwhelmed, scared, and honestly unsure if we would be able to keep him. From day one, Dion never judged us or our dog. Instead, he took the time to teach us how to understand our dog’s behavior, build trust, and most importantly, keep ourselves and everyone around us safe in every situation. He didn’t just train our dog—he gave us the knowledge and confidence to become better owners. One thing that truly sets Dion apart is that he cares about the whole dog, not just obedience. During one of our training sessions, he noticed our dog’s severe skin allergies and recommended switching him to a raw diet. Within just two weeks, the transformation was incredible. His skin cleared up, his allergies dramatically improved, and he became a much happier, healthier dog. That advice alone changed his quality of life. Because of Dion, we made the decision to keep our dog instead of giving up. Looking back now, we can’t imagine our lives without him. That is something we will always be grateful for. Over the course of this journey, Dion has become much more than a trainer. He has been a mentor, a source of encouragement, and a genuine friend who has supported us every step of the way. It’s rare to find someone who is this knowledgeable, compassionate, and truly invested in both the dogs and the people he works with. If you’re looking for someone who will not only train your dog but also teach you how to build a lasting relationship with them, I cannot recommend Dion and K9 Ancillary highly enough. Thank you for helping us save our dog, giving us confidence, and changing all of our lives for the better. We are forever grateful. We are happy to say he is a very happy boy and lives an amazing life and still is his goofy self.

Jaye Birdsong
5/5
I found Ancillary K9 & Dion after my dog got into a fight with another dog. My two dogs were both reactive, causing scenes with other dogs. I was scared to walk my dog, I wasn’t sure if it was safe to let him out for potty breaks…Dion changed all of that. Nervousness turned into …Read full reviewClose full review

I found Ancillary K9 & Dion after my dog got into a fight with another dog. My two dogs were both reactive, causing scenes with other dogs. I was scared to walk my dog, I wasn’t sure if it was safe to let him out for potty breaks…Dion changed all of that. Nervousness turned into confidence and doubt turned into control. I didn’t feel like I could walk my dogs one at a time let alone together, now I can walk both of my dogs at the same time, by myself, with full confidence that they are in my control. I never would have in my wildest imagination believed that my dogs could see a rabbit and not react or come inside with only one command while distractions are around. But that is the wonderful life that we get to experience together now. And my dogs get to go out into the world and experience what it has to offer rather than being isolated living in fear. Thank you so much Dion!

Christie
5/5
My 8 month old golden doodle, Dolly, and I have been working with Dion for a couple of months now and I cannot say enough positive about him and his training methods. There have been so many wins but I’ll highlight a few that have been most valuable to me. Loose leash walking: th…Read full reviewClose full review

My 8 month old golden doodle, Dolly, and I have been working with Dion for a couple of months now and I cannot say enough positive about him and his training methods. There have been so many wins but I’ll highlight a few that have been most valuable to me. Loose leash walking: the education Dion gave us corrected Dolly’s pulling in a way that nothing I’d tried up until that point had. Second, recall. At 8 months old this baby has a more solid recall than I’ve ever has with any dog. We continue to work it as instructed in increasingly distracting environments to really lock it in. And third, her overall improved focus and compliance. I love being outside and it was so important for me to have a well behaved dog in public. We’ve tested her at t-ball games, garden stores, coffee shops, etc. and she’s truly exceeded what I believed she’d be capable of at this age. If you’re browsing the reviews trying to decide if it’s worth the investment, it is. I cannot recommend Dion enough. The training and tools he provides are a life long gift for you and all your fur babies, now and in the future.

Original customer experiences from the collected Google data. Ratings without comments follow written reviews.

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