You don't have to sign anything. You agreed to company policy and punching the clock or taking your first check enters you into contract.
If you REALLY wanted to do more then you would not be wasting you time just working for them.
You would be on the phone with your local animal control and/or figuring out why they are not doing anything with the store.
You come here asking for help in YOUR city and then don't like being told to figure out who to call.
Its not really that hard to figure out if you tried doing it the correct way.
More power to you though.