From experience- the dog will have to be taken to the vet for observation. No ifs, ands, or buts. Get an attorney and they will go after the homeowner’s insurance. The attorney will tell you it doesn’t matter if you were an invited guest or not. I was told if you’re boiling water for spaghetti and a burglar enters your dwelling and is burned by the boiling water, you are liable. Same with the dog.