Trainers for aggressive dogs in Denver
4 listings · A–Z
Not a ranking
Safety first
- If anyone is in immediate danger, contact local emergency services.
- If a person or animal is injured, get medical or veterinary care first.
- A sudden change in behavior can have a medical cause. Talk with your veterinarian.
- Tell any trainer about bite history up front, including bites that did not break skin.
This directory can't assess your dog or give behavior advice. Read our safety guidance.
These businesses say on their own websites that they work with aggression. Methods differ between them and are shown as each business states them. Listings are informational, not rankings or endorsements.
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Denver
Blitz Dog Training
Dog trainer / behavior consultant
Serves Denver metro
Behavior modification for reactivity, fear, anxiety, and aggression
Methods, as stated: The business describes its work as force-free, fear-free, positive reinforcement, and science-based.
Checked September 2, 2026
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Denver
John's Dog Magic
Dog trainer / behavior consultant
Serves Denver, Littleton, Englewood, Lakewood, Centennial, Aurora, Arvada, Golden, and the wider metro
Dog reactivity, aggression, biting, fear, and rescue-dog services
Methods, as stated: The business states that it uses positive reinforcement without shock or prong collars.
✓ Credentials stated Checked September 2, 2026
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Denver
Kali Grimm Canine
Dog trainer / behavior consultant
Serves Denver; virtual service worldwide
Reactivity, fear, aggression, and complex or high-risk cases
Methods, as stated: The business describes its approach as reward-based and LIMA.
✓ Prices listed ✓ Credentials stated Checked September 2, 2026
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Denver
The Joyful Dog Co.
Dog trainer / behavior consultant
Serves Central and west Denver metro; virtual service
Reactivity, aggression, and leash-skills support
Methods, as stated: The business states that it uses positive reinforcement.
✓ Credentials stated Checked September 2, 2026
Questions to ask before you book
- Do you take dogs with my dog's bite history?
- What methods and equipment would you use, and why?
- Do you work with veterinarians or veterinary behaviorists when a case needs one?
- What happens if my dog's case is outside what you handle?
- What does the first session cost, and what does it include?
Not sure whether you need a trainer or a behaviorist? See who does what.