Find a Renter's insurance for him

Find a renter's insurance that covers his dogs, and make him buy it.  Don't just let him do it, you find the insurance for him and make him buy it.

https://www.apartmentlist.com/rentonomics/renters_pet_insurance/

Most insurance groups include renters pet insurance, providing the insurance holder with legal coverage in case your pet injures someone or causes property to damage.