So, is it reasonable to expect your dog to be allowed into a friend's house?

[HerBeatitude]

Am I being unreasonable not to let my friend's dog in? I have a 100ft garden where he can go and play while she visits and he gets water out there, I won't let him in because he smells and he makes little footprints all over the floor and I can't be arsed to clean them up. She feels hard done by and thinks I should just put up with him.

Who is an unreasonable prima donna, her or me?

YANBU, I wouldn't let it in the garden either. My sister always brings her dog to my house and stands looking resentful on the doorstep with dog because she knows I don't want it in the house.
It is rude of your friend to bring it in the first place. Whereas I know my sister is trying to make the point that I am uptight and selfish and will continue to stand on doorstep with dog in order to make this point until the end of time.

Dog owner here - YANBU