turkey knuckles are fine....they are too expensive for me! The necks are full of bone and one neck from a tom turkey weighs almost a pound, so I cut them and add in more meat and organ. My dogs love turkey necks.
Venison bones are too dense, I don't feed any bones from red meat animals. Pork neck bones are as hard as I go, maybe some chops or small rib bones, I watch the dogs when they eat those.