Moving to privacy. It is illegal to record conversations without the other party's consent.

Moving to licensing, so you get better answers.

Find a responsive attorney. Use the Avvo search tool and/or your county bar association to find one.

Report the dog to animal control as abandoned, based upon the above.

Notify your homeowners carrier and try to get witness statements.

Bring the file to a litigator who deals with breach of contract cases.

You don't say when this happened and likely don't know to whom your animals were given. You could file a replevin action against your father, but...

"My neighbor got bite by a visiting friends dog on her property?" How would we know? If it is your friend's dog, she is the responsible...

This is not a landlord/tenant issue - moving to lawsuits and disputes, so you get better answers.

It's his property; not yours. Unless your lease grants you exclusive use of the grounds, he is perfectly within his rights to put the signs up.