This is a landlord/tenant issue - moving accordingly. "The lease does not mention anything about pets. " Then the LL cannot prevent you from...

What information would it need for an owner to register a pet under my name?

1. STOP sending money, and; 2. Demand proof of registration under your name. For that matter, you should be able to check yourself.

The animals are a weapon; the real issue is your roommate. Protect your pets and yourself by finding a new place to live.

What can I do if the owner of the house I live in has passed away and his grandson gets out of jail and tries to take over

1. This has absolutely nothing to do with animal law - moving to lawsuits and disputes. 2. The time to act was when the grandson forced his way...

She has no such authority. IF your dog was neglected or dangerous, she could call animal control.

Am I liable?

There seems no proof it was your dog, other than the other owners claiming it was your dog - NOT theirs. If you do decide to pay, get a receipt...

1. This has nothing to do with animal law - moving to land use/zoning, as zoning is more relevant. 2. How is this your issue?

What action should I take?

The issue is not with your landlord, but with your roommate. As you are sharing the space, expecting her cooperation is not unreasonable.

Read the ticket and file the appeal as specified on it. Then attend the clerk magistrate hearing and argue whatever facts you have to present.

Given the incarceration, the issue may well prove moot. Keep a record of all expenses incurred caring for the dog during the imprisonment.