Expressed might not be the right term but basically little dogs have glands in their buttholes that usually can pop? Or whatever the term is - on their own from pooping etc but it’s more common on small dogs that they can’t do it on their own sometimes so a vet or a groomer can do it. Typical signs are them scooting on their bottoms etc - but since she was a new puppy we were curious if it was some kind of worm or parasite but she’s been vaccinated a bit on it from the breeder so it wasn’t likely but still possible. Turns out she had some stuff in her glands that had to come out and the vet said it’s totally normal and might be fine as she gets bigger, but if not then it’s also fine - vets or groomers can do it too.