This is not your issue. Your BIL can retain counsel in the DR to deal with it.

YOU wrote the contract, you are bound by its terms.

Moving to landlord/tenant. It seems you bought a property subject to existing leases. Discuss with an attorney versed in tenant law.

The obvious first step is to contact Animal Control. He is likely violating game laws.

FL has a puppy lemon law. Discuss whether you have a claim under it w/an attorney versed in animal law.

Moving to landlord/tenant, where this belongs. You are not obligated to renew their lease, simply to give timely notice that you are not doing so.

Moving to DWI, which is far more relevant. Simple prudence suggests you pull over for the blow test.

That seems ridiculous as to both points. The real question is, is worth it to fight it? I would keep the bottle, but that is me.

Moving to the landlord tenant, which is far more relevant.

Moving to defective and dangerous products, which is far more relevant.