Don't want to hijack this thread, but feeding raw meaty bones to dogs is a critical topic.
Chicken wings are greyt, though they are a bit small for my dogs. I feed them raw turkey necks instead (chicken necks are good for smaller dogs). Remember, with poultry, only feed RAW bones and meaty pieces and only NON-WEIGHT-BEARING bones! No legs or thighs. But backs, necks, wings and "frames" are all fine. Cooked bones from any source and weight-bearing bones splinter and are
very dangerous for pets.
The only place I've found
Solid Gold Green Tripe for my dogs is at Metzger's Country Store in Simpsonville. I'm personally responsible for starting a "run" on tripe there. When my dogs tried it at a Greyhound event in Gettysburg, PA, I found it there after our return. $1.51 a can. I ordered a case and a bunch of my friends ordered their own cases.
You might look for the Solid Gold or Tripett brands at local natural foods stores.
Two words of caution:
(1) This stuff STINKS. But those plastic dog food can covers keep the smell contained while storing opened cans in the refrigerator.
(2) This stuff is RICH and contains a lot of fiber. I recommend a teaspoon of green tripe added to the kibble feed to small dogs and up to a heaping tablespoon for large dogs like mine (65-85 pounds). So I get about 9 servings out of a single can.