Colorado's rabies vaccination requirement
Colorado requires rabies vaccination for dogs and cats in most jurisdictions. While there is no single statewide mandate, the Colorado Department of Public Health and Environment (CDPHE) (accessed August 30, 2026) provides guidelines under the Colorado Compulsory Rabies Vaccination Program (accessed August 30, 2026), and most counties and cities have adopted local rabies vaccination ordinances. In practice, rabies vaccination is required across all major Colorado population centers.
Colorado's rabies context is real — the state reports bat rabies cases annually, and skunk rabies occurs in the eastern plains. Coyotes and foxes are common across the Front Range, and encounters with raccoons and skunks are routine even in Denver suburbs. Keeping vaccination current is genuinely protective, not just a licensing requirement.
Licensing by city and county
| Jurisdiction | License Required? | Altered Fee | Unaltered Fee |
|---|---|---|---|
| Denver | ✓ Dogs + Cats — Denver Animal Protection | ~$15/year | ~$50/year |
| Colorado Springs | ✓ Dogs + Cats — Humane Society of the Pikes Peak Region | ~$10/year | ~$30/year |
| Aurora | ✓ Dogs + Cats — Aurora Animal Services | ~$15/year | ~$50/year |
| Boulder | ✓ Dogs + Cats — Boulder Open Space & Mountain Parks / Animal Control | ~$15/year | ~$40/year |
| Fort Collins | ✓ Dogs + Cats — Larimer Humane Society | ~$10/year | ~$30/year |
| Jefferson County | ✓ Dogs — Table Mountain Animal Center | ~$15/year | ~$30/year |
| Arapahoe County | ✓ Dogs — Arapahoe County Animal Services | ~$15/year | ~$30/year |
Denver: how to license your pet
Denver Animal Protection (accessed August 30, 2026) requires all dogs and cats within Denver city limits to be licensed. Denver is notable for being one of Colorado's strictest enforcement cities — and it recently lifted its long-standing pit bull ban, making licensing especially important for newly eligible breeds. The process:
- Ensure rabies vaccination is current — required before any license can be issued.
- Gather spay/neuter documentation — reduces the annual fee from ~$50 to ~$15.
- Register online through the Denver licensing portal or in person at the Denver Animal Shelter (1241 W Bayaud Ave).
- Pay the annual fee and receive your license tag.
- Renew annually — Denver sends renewal reminders, but the onus is on the owner.
Boulder: voice-and-sight tag program
Boulder is unique in Colorado for its voice-and-sight tag program — dogs that pass an off-leash obedience test can earn a tag that allows off-leash access in designated Boulder Open Space areas. This requires a current license, current vaccinations, and passing the test administered by a certified evaluator. If you're a Boulder dog owner who values off-leash trail access, this program makes licensing directly tied to your daily dog experience.
Colorado's wildlife context for pet owners
Colorado's wildlife interactions shape why licensing and vaccination matter more here than in many states:
- Bat rabies: Colorado reports bat rabies cases annually across the state. Bats can enter homes and expose pets — rabies vaccination is protective
- Skunk rabies: Concentrated in the eastern plains, but present in suburban Front Range areas
- Coyotes: Active across the Front Range and mountain communities. Not a rabies vector (typically) but a predation risk for small dogs and cats
- Mountain lions: Present in foothills communities from Boulder to Colorado Springs. Keep small pets supervised
- Plague: Yes, plague (Yersinia pestis) (accessed August 30, 2026) is present in Colorado prairie dog colonies. Dogs can contract plague from infected rodents — not common, but a unique Colorado consideration
What you need for a Colorado pet license
- Current rabies vaccination certificate — the universal prerequisite
- Spay/neuter certificate or vet letter — significant fee reduction across all Colorado jurisdictions
- Proof of Colorado residency (driver's license, utility bill) — some cities require this
- Microchip number — increasingly recorded as part of registration
Your document checklist
Last verified: August 30, 2026. Licensing fees and requirements vary by jurisdiction — check with your specific city or county animal services for current amounts and deadlines. This page is informational.