My poor old cat is on his way out. Back legs flopping etc. He is 17 after all but I am
. He's off to the vet's next week for a check but I'm not optimistic at all.
First thing mil says when she hears is, "Oh good, I can bring the dogs down with me next time." Ah, the sensitive soul. 
I don't want her dogs here at all. I like dogs but not her yappy ones that I'm convinced have made ds1 afraid of dogs in general.
Plus pil stay in a hotel when they're down here so they'd leave the dogs in our house. No doubt I'd end up having to walk them last thing at night and first thing in morning (our garden isn't secure) and I clear up enough crap as it is.
Plus she'll want to take the dogs on any day trips we do and it'll restrict our options somewhat i.e. we wouldn't be able to to the zoo or anywhere dog free.
The dogs usually go to a dog sitting woman when pil come to visit and they seem happy enough. Mil misses them for the three days she's away but that's life, isn't it?
Also, we will probably get cats again in due course and I don't want mil to think bringing her dogs is ok even when we get more cats.
I just feel it's a presumptuous imposition. Aibu to say you're welcome to come and visit but your dogs just aren't?