No way, farmgirl2477, get a Llama!! A Llama would be way easier and cheaper to maintain then a donkey...and quieter. Plus I've been looking at Llama prices(cause I want one!!) and it seems you can get one for about $300. Donkeys, around here at least about the same price as a horse, at least $800. Of course you can't ride a Llama either...
Anyhow I have goats, don't seem to have any trouble with predators (unless you want to call a thieving chipmunk one, lol) I used to have skunks around, but it seems they've disappeared since we got the goats. Never had a problem with hawks, so couldn't say if the goats are helping deter them or not.