I will attempt to answer this in colour coordinated replies
1.Toby has one whole one for breakfast every morning - the girls have half each. Toby's still quite young (14 months) & a far busier/ more active dog than the more 'sedate' girls - let 'maintaining a weight your happy with' be your guide
4. no experience of feeding at that age but would guess it would be fine (hope someone who has experience comes along to answer this correctly one for you
3. My 4 have them for breakfast everyday 4. yes I feel carcassess are better than wings in way of nutritional value & for teeth cleaning etc .... wings can go down in one chomp sometimes whereas the carcass takes a little more chewing
My 4 have additional minced meat/bone/fish/offal ( type varying from day to day) + blixed veg at tea time.
(tip for splitting carcass - slide thumb down ribs of carcass, then pull up & apart the two halves. I find it easier to do proir to feezing & wear protective gloves ....thumb can get sore after doing quite a few

)
Hope this is of help

Lindseyx