Massachusetts Rabies Vaccination Laws for Dogs and Cats

Updated October 13, 2026 · 1 min read · 4 sources

Short answer

Massachusetts requires dogs, cats and ferrets 6 months or older to be vaccinated against rabies by a licensed veterinarian, with boosters at the manufacturer's interval (M.G.L. c. 140, s. 145B). Animals brought into the state must be vaccinated within 30 days or by 6 months. Violations carry fines up to $100.

Massachusetts requires rabies vaccination by state law. Here is who must be vaccinated, when, and how the rules are enforced.

Massachusetts rabies vaccine rules at a glance

Question Answer
Animals covered Dogs, cats and ferrets
First vaccination 6 months
Boosters Per manufacturer
New arrivals Within 30 days or by 6 months
Statute M.G.L. c. 140, s. 145B

What Massachusetts law says

  • Section 145B requires vaccination of dogs, cats and ferrets 6 months and older.
  • Vets issue a certificate and tag; cat and ferret owners may keep the tag available instead of on a collar.
  • Exemptions exist for certified medical reasons and animals in transit or at shows.

How rabies boosters work

The first rabies vaccine is treated as good for one year, no matter which product is used. After the one-year booster, vaccines labeled for three years are generally accepted as protecting for three years, if state and local law allow it (Compendium of Animal Rabies Prevention and Control). Your rabies certificate shows the exact due date, and that date is what animal control and licensing offices go by. More detail: how long a rabies shot is good for.

Cats and other pets

Cats and ferrets 6 months and older are covered in Massachusetts.

Rabies vaccination is also tied to licensing in many places; see Massachusetts dog license requirements. Your local veterinarian or a low-cost vaccine clinic can give the shot and issue the certificate and tag.

Sources

  1. Michigan State University Animal Legal & Historical Center: Massachusetts dog laws
  2. Michigan State University Animal Legal & Historical Center: Table of state rabies vaccination laws
  3. dvm360: New rabies recommendations for dogs and cats (Compendium of Animal Rabies Prevention and Control)
  4. AAHA: 2022 Canine Vaccination Guidelines, core and noncore vaccines

Find help near you in Massachusetts

This page summarizes state statutes for general information and is not legal advice. Laws change and cities and counties often add their own rules; check the current statute and your local ordinance, or ask a licensed attorney about your situation.

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