I've got a young baby, I think you should ask before turning up and bringing your dog. I was so surprised. She said "Well I want him to learn to behave when I go out so I brought him" I mean, he's okish but he jumps up loads and I wouldn't put the baby in her seat because I find these small dogs to be so unpredictable. A friend's daughter was bitten on the face by an excitable westie who was 'only jealous!" typical dogfanatic anthropmorphic apologia for appallingly out of control dog.
I just wish people wouldn't impose their dogs on me! How rude not to ask.