Cats in Maryland, United States: rules and travel
Dogs and cats need rabies shots from 4 months. A dog that injures someone creates a rebuttable presumption that the owner knew it was dangerous.
Counties set licensing and most dog rules.
The national rules for United States apply here too. National rules
Keeping rules
Rabies: cats 4 months or older, same rule (Health-General 18-318).[1]
Laws change: this is general information, not legal advice. The authority linked on each line has the final word.