[If they had enough money to feed a pack of 7 big dogs they should have enough money to have them euthanized.]
Euthanizing pets costs peanuts. This is a semi-rural area. A .22 in the cranium is a dime, tops, instant and less stressful for a dog than suffocating to death from an injection. Add a big serving of dollar store generic Benadryl to the kibble, and they’ll be too drowsy to resist, as graduates from the Kristi Noem School of Veterinary Science will be glad to attest.