>I wonder if there are any other words like foupe that can only be applied to animals not to humans? <

I am wondering about 'neuter' - in a verbal sense.

Cats and dogs get neutered - whichever gender they start off.
Bullocks, I am pretty sure, get castrated.
Cows, of course, are saved by our desire to have them produce milk, but if they were to undergo the equivalent operation, what word would be used?

And for humans? Sterilised? Which, if you think about it for a moment, has a totally different meaning normally - and sounds an even more painful experience! I picture myself being boiled alive!