I think he/she needs the vets on Monday if no change.Make sure there is plenty of water for your pal.It could just be a 24 hour thing or it could be more serious, hope all goes well.g
i agree, best to be safe. It could be something and nothing.
I had that with pup a week or so ago, don't know what caused it but it passed and all was well. Just made sure he had ample water and he recovered and got a good appetite back.
Best to chat to vet if you are at all unsure. Sure westie will be fine tho :o)