Originally posted by wolfsoul
Good point! That's probably it.

And yes, castrating is much easier. They will even let the vet techs do it. You know that they can do it without anesthesia if you want? I think that's just terrible!
They charge more for larger animals due to a combination of reasons, they use more anesthesia (which to complete the anesthesia they use a multiple of drugs, a pre-op shot, one that makes them wake up smoother etc), the procedure takes longer because everything is larger (more to cut, more to remove) they use more sutures, the amount of cleanup takes longer.

Although you can castrate an animal easier than spaying it should still have anesthesia, especially in dogs!
Never seen a vet tech neuter a dog (it is illegal anyways in my area) although they do alter male cats.
Male cats are so easy I have neutered quite a few while working as a vet tech. If I had anesthesia I would go around to all the farms etc... & neuter them for everyone that does not have enough $!