When talking with animal control (based on my experience from when I volunteered at a shelter in California):
1. State that the property owner/renter said the dogs were strays that he feeds.
2. State that the property owner/renter said that the dogs hunt as a pack, and state that you don't know if the dogs are hunting deer or livestock.
3. Tell them about the neighbor's child and give them the neighbor's address and telephone number if you know it.
4. Tell them that the local Sheriff apparently knows the stray dog feeder.
5. Tell them that the dog feeder gave you a can of pepper spray to spray the dogs with (which now shows that the dog feeder knows that the dogs are a nuisance).
6. Do not tell them about the hog trap or the lethal options you have considered.
7. Report back here with an update.
8. Keep an eye open for tacks in the roadway once the dogs are removed.

The above are just thoughts and suggestions, use your own judgement on what to do and say.