The guy I'm seeing just bought a puppy and tbh I'm not a dog person whatsoever. I don't hate them or anything but I don't really like having animals around me. His expecting me to stay in his house but I'm already panicking thinking about this little dog jumping all over me. Should I tell him I'm not that keen or what because he seems to love this new puppy and I don't want to be mean to him?
Did he know you don't like dogs before hand? Either way seems unlikely he would take it back now that he has it, so you can either get use to it or decide it's a deal breaker. Depending on the length of your relationship though I it seems strange he wouldn't of said anything before hand.
I don't prefer dogs and if the relationship was young I wouldn't consider it long term, if it was a long term relationship I would of expected to know about it before hand or would make her take it back.
This may be a good time to learn to like (or at least tolerate) canines. Puppies are innocent, sweet and eager to please. Try to have an open mind. At his age, a puppy WILL jump, it is up to his humans to teach him not to.
Above all, be honest with your boyfriend so he can be prepared for your visit by penning puppy up, etc.
Did he know previously that you didn't like dogs? If you never told him that then you can't really expect him to know and now get rid of his new puppy. If he did know before and got a dog anyway then it's understandable that you would be bothered.
Unless this puppy is a deal breaker for you, then you just have to try to adapt and tolerate the dog. He can keep the puppy in another room when you're at his house. All puppies jump though, he'll need to train the dog to not do that.