The dog is "property" his separate "Property" prior to marriage, not marital property, he can remove his separate property from the home if he wishes. It is not your dog. It is not your property. Don't make an issue of it and that will take all the fun out of it for him, then clean hous real good, to get rid of the pet oders and breath easier than you will be rid of your burdens. His Ex will tire of caring for the dog after too long. Dogs lived outside she will be ok. With a name like Harley I will ask if the dog is a pitbull by any chance?