If you have a puppy, the adopter must agree to have the dog neutered as soon as possible. Heartworm disease is a serious problem in this area. The disease is transmitted by mosquitoes and is deadly. If your dog has not been heartworm tested or is not on preventative, you should have it tested immediately. The dog must have a current rabies vaccination.
State laws require rabies vaccinations for all dogs.
A dog that has bitten is a serious liability today. You should have your basset checked by a veterinarian to be sure that there is no medical reason for the aggression. For a dog that bites, euthanasia may be your only option. If your basset was provoked, either intentionally or unintentionally into biting, than you may still be able to find a suitable adopter. They are not willing to take a chance on a basset that has bitten.