Welcome. If all goes well your little guy should be fine when you pick
him up. If the neutering was done that day, you might want to ask for a pain
pill (I gave my little guy one on the day he was neutered right before he
went to bed). Some vets use cones (goes over the head and around the neck)
to keep the dog from licking or pulling on the stitches, some don't, so you
will have to make sure he (or your other dog) doesn't mess with them.
While wearing the cone, he may have difficulties eating and drinking while
wearing it, so he may need some help. With time, they figure it out. Other
than that, it should all be OK.
Gloria