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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
  • 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

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
  • 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
  • Separation anxiety

How training happens

  • Board and train
  • Group classes
  • Owner coaching Customer-reported
  • 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

Support between sessions

  • Homework and practice Customer-reported
  • Personalized training plans

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

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

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
  • Basic Commands
  • Behavioral Evaluations
  • Behavioral Program
  • Canine Rehabilitation
  • 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
  • Dog Bites
  • Dog Evaluations
  • Dog Park
  • Dog Starts
  • Dog Trainers Schedule
  • 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
  • Dogs Treats
  • Family Dogs
  • Guard Dogs
  • Obstacle Courses
  • 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
  • Dog Temperament Assessment
  • Dog Temperament Test
  • Working Dog Training
  • 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 Rice
5/5
After much internet sleuthing for a dog trainer who would provide lasting results, I kept circling back to Dion’s website. Multiple peers recommended board-and-train programs, but I ultimately preferred to be involved in my dog’s training. This strengthened our relationship and h…Read full reviewClose full review

After much internet sleuthing for a dog trainer who would provide lasting results, I kept circling back to Dion’s website. Multiple peers recommended board-and-train programs, but I ultimately preferred to be involved in my dog’s training. This strengthened our relationship and has made maintaining what we both learned during our sessions straightforward. Although Dion specializes in reactive and “problematic” dogs, his training methods are equally applicable to dogs who struggle with the basics. My dog, Reicher, fell into the latter category. When we first started, he had absolutely no leash manners or recall. I dreaded walks with him, because he would incessantly drag me along. Pre-training, Reicher was also quite fond of darting out of the house and refusing to come back. This caused many stressful situations for both me and others. I avoided taking him with me out of fear that he would run away and be hit by a car before I could get him back. Fast forward about a year since we completed our sessions, and I have a completely different dog. Reicher gets compliments on his manners both on and off-leash. Using the e-collar has made it possible to supplement his reliable recall with off-leash adventures when appropriate. One of my fears about training was whether it would impact his friendly and goofy personality. Instead, it has allowed both of us to have clear communication regarding expectations, and he now has much more freedom. As a trainer, Dion is clear about the outcomes to expect from his program and empowers you and your dog with personalized advice to achieve success. He stands by his lifetime guarantee and responds promptly to any issues or questions that arise, both during and after training. I included some photos from numerous adventures we've been able to enjoy together since completing training.

Anna Armas
5/5
I can’t say enough good things about Ancillary K9 Dog Training's program! Dion is incredibly knowledgeable his explanations and real-life examples make the concepts easy to understand and apply. Before training, I couldn’t even take my dogs for a walk. They’re not small, and I s…Read full reviewClose full review

I can’t say enough good things about Ancillary K9 Dog Training's program! Dion is incredibly knowledgeable his explanations and real-life examples make the concepts easy to understand and apply. Before training, I couldn’t even take my dogs for a walk. They’re not small, and I simply couldn’t control them it started to feel like we were all prisoners, stuck inside and unable to enjoy going out together. Now, I’m proud to take them out! The transformation has been amazing, and I haven’t even completed the full program yet. I had considered a board-and-train option, but I’m so glad I decided to do the training myself with my dogs. Working directly with Dion has given me a much better understanding of what I need to do, why it works, and how to make corrections and stay on track. It’s been a great bonding experience, and I’ve genuinely enjoyed the process. I highly recommend Dion and his program to anyone who wants real results, a deeper connection with their dogs, and the confidence to continue and maintain their dog's progress long-term!

Kyle Miller
1/5
DOG HAD TO BE PUT DOWN: Went for a consult, didn't agree with his methods. Parents decided to go through with the training. Aggression got worse and they ended up needing to put one of their two dogs down (which I WOULD NEVER DO, but these are the type of people who choose Dion a…Read full reviewClose full review

DOG HAD TO BE PUT DOWN: Went for a consult, didn't agree with his methods. Parents decided to go through with the training. Aggression got worse and they ended up needing to put one of their two dogs down (which I WOULD NEVER DO, but these are the type of people who choose Dion and his methods). Dion also decided to try to have reviews removed calling them fake.... Well that's not a good look or an honest company. Dion can respond back however he wants, likely taking no accountability and blaming my parents, but at the end of the day.... Do you trust someone who touts their success rate and then tries to hide the failed trainings and their associated reviews? No house calls, no traveling to the locations where the problems would occur, no additional efforts to understand the dogs as individuals and what THEY would need or what would serve them best. It's "do what I say and use my tools" and if there's a failure he will blame anyone but himself. Bottom line... He does not share what I would consider to be the Colorado way of dog training. P.S. The second dog whom went through this training is still alive and has more aggression than when she started.

Barbara Drake
5/5
When I moved to Denver to be closer to my grandkids I realized my dog had not really had any exposure to kids and he was not sure about them. We had a couple incidents that made the kids scared of him. I realized I had to find a trainer to help me with him and figure out how to…Read full reviewClose full review

When I moved to Denver to be closer to my grandkids I realized my dog had not really had any exposure to kids and he was not sure about them. We had a couple incidents that made the kids scared of him. I realized I had to find a trainer to help me with him and figure out how to develop a safe relationship with the kids. Dion was wonderful working with me and Malachai to develop our relationship and therefore help me re-introduce Malachai to the kids. We have worked really hard and as the pictures below show, the kids have become more comfortable and trusting of Malachai. We will continue to work with Dion!!!

Michael Kramer
5/5
Dion is an expert in his field. He provides detailed guidance, ideas, and instructions at each training specifically tailored to your dogs needs and behavior. He’s great to work with and cares about his clients. My Aussie shepherd was an unpredictable dog before meeting and train…Read full reviewClose full review

Dion is an expert in his field. He provides detailed guidance, ideas, and instructions at each training specifically tailored to your dogs needs and behavior. He’s great to work with and cares about his clients. My Aussie shepherd was an unpredictable dog before meeting and training with Dion. With Dion’s training we have come up with solutions to make me feel comfortable taking him into public, go camping, and be around my 4 month old baby. Highly recommend! Thank you Dion and team.

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

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