I think I have recounted before about my bil and sil who take great offence if we ask them to not bring their dog as it upsets our cats and this is their home.
We asked him to tie it up in the hall while we ate once (they had ignored us again and we blinked first!!) but halfway through the meal he brought the dog in as 'it was unfair ro leave her on her own while we are having a nice time'. 
We now add a rider to every invitation and they rarely come here at all.
So it begins….. Streeting resigns
My DH gets annoyed if a dog is bothering us and the owner says 'he won't hurt you'. DH always says 'has he told you that?'. My brother always had dogs and made no attempt to train them. I can remember sitting in his house waiting for them to get ready as we were going out. I had a cup of coffee in my hand and their dog was being a real nuisance. Eventually he nudged my cup and the coffee went all over my white trousers. That was my night out up the swanny. He didn't mean it apparently.

