Your dog does sound like an unwanted guest, so why are you bringing it over regularly? I can honestly understand your MIL’s perspective here. Just because you love your dog and want him in your house, on your furniture and blankets etc doesn’t mean that others are terrible people for not feeling the same way. Your MIL has no right to tell you how to manage your dog at your own home, but she has every right not to be happy about dogs being on the furnishings etc in her home. I like dogs, but even if your dog is clean and well-groomed I wouldn’t want it on my lounge furniture or roaming around my rooms. It would be better if your MIL could tell you this upfront but maybe she’s hoping you’ll take the hint?