Massachusetts Pet Laws

This page summarizes the main state laws that affect dog and cat owners in Massachusetts, with links to the full guide for each topic. State law sets the baseline; your city or county can add stricter rules, so check local ordinances too.

Massachusetts Dog License Requirements

Yes. Massachusetts requires every dog over 6 months to be licensed with the city or town (M.G.L. c. 140, s. 137). A rabies vaccination certificate or exemption is required. Cities and towns set the fee, with a lower rate for spayed or neutered dogs and no fee for service animals; licensing violations carry at least a $50 penalty.

Read the full dog license requirements guide →

Massachusetts Leash Laws

Massachusetts has no statewide leash law. Leash rules are local bylaws, and city or town officials may order dogs restrained from running at large (M.G.L. c. 140, s. 167). Dogs must be leashed at highway rest areas (s. 174B), and tethering is limited by s. 174E.

Read the full leash laws guide →

Massachusetts Dog Bite Laws

Massachusetts is a strict liability state. Under M.G.L. c. 140, s. 155, a dog owner or keeper is liable for damage to a person's body or property, unless the victim was trespassing, committing another tort, or teasing, tormenting or abusing the dog. Children under 7 are presumed not at fault. The deadline is 3 years.

Read the full dog bite laws guide →

Massachusetts Rabies Vaccination Laws for Dogs and Cats

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.

Read the full rabies vaccination laws guide →

Massachusetts Pet Limit Laws: How Many Pets Can You Own?

Massachusetts has no fixed statewide pet limit, but keeping more than 4 dogs 3 months or older makes you a "personal kennel" that needs a kennel license (M.G.L. c. 140, ss. 136A, 137A). The licensing authority inspects and sets the maximum number of animals. Cities and towns may have their own limits.

Read the full pet limit laws guide →

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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