I've been watching this thread for a little , and I'm so glad Maisie had chilled down a chicken wing. Flo has one almost every day after my vet recommended for a daily feed one chicken wing and half a cup of good quality kibble. I must say the first time she was given a wing ( out on the balcony where she can't bury it) I turned my back and it was gone in a second ... She was only a 8mths old and I had no idea they could chomp through them that fast... A waited anxiously... But no I'll effect, and now we only have to say chicken wing and she's salivating.... Her kibble comes a poor second meal now. I have tried her on marrow bones but she licks and plays with them and when let inside she sneaks them in to put in a special hidey place or take them to the garden to bury. I also now feed her chicken necks ( as they're lower fat than wings and we had a lot I'd very heavy rain when it was difficult to walk her... So the vet suggested the necks). My vet also suggested turkey necks, and also roo tails, which apparently are easy enough ti find here in OZ but I haven't managed yet so source. I have to say the poos a much drier and manageable than before she was on the chic wings.
I haven't tried any fish heads etc, only tinned sardines on kibble, but look with interest what anyone says about fish. Flo has but given some raw prawn heads but turned her nose up at them.