Boyfriends dad

Hey everyone, my daughter not my boyfriends biological child, but very much treats her so which is amazing. His family are also so good with her. There is one thing that I don't know how to take. I don't agree with but I'm very much 'their house, their rules' type of person, and have no problem with that. Whenever we're there and the dog is asleep, my boyfriends dad tells my daughter to talk quietly and whisper or don't make too much noise as the dog is sleeping. Baring in my daughter is 2. I've had pets, we've been around dogs in other people's home and she has never experienced this. I do think it's abit much and overkill, but I don't make an issue about it. What do others with dogs think. Would they tell a toddler the same thing if their dog was asleep?