I know - it's just short from the old days: human wormer, pet wormer, horse wormer, pig wormer and so forth and so on. I am glad my grandma didn't call it people wormer - that would've been PEOWORM! (pee - a - worm) LOL!!
I can put a little extra Black-Walnut into the mix - Tapeworms absorb it into their bodies and die :)