Aww, what a nightmare you had to deal with. It's been said that there is no bad dogs, only bad owners and that's true...to a point. We also own one of those empty brain boxes in a dog suit.
The owner showed no respect and yes, your husband shoulda have stuck up for you, but he didn't. I would be hopping mad myself.
First of all, the comforter needs to be dry-cleaned. You might think it's embarrasing to take it to the dry cleaners, but I'm sure they've had to deal with other embarrasing things on fabric. AND the owner of brain dead needs to be the one paying the drycleaning bill. I'd send him the bill and not even tell DH that you sent it. DH might get mad about that, but he'll have to get over it eventually.
I have one good dog that has such awesome manners and listens so well that my SO actually allows her to be the first dog to ever live inside this house in it's 40+year history. The other one, the one I call HIS dog, is plain and simply brain dead. That one lives on a run, has a dog house and is given all the things the good dog gets, only outside.
It's all about respect, as I said. The man doesn't respect you, your DH or your family, so he'd be history as far as I was concerned. Dealing with the DH's lack of respect is way trickier. Perhaps showing him a little less respect, in some small way, will remind him that you have to give it to get it.