They should probably all be on a coprophagia deterrent from the vet (less likely to have calories like pineapple).
It's all about the kcals - how much they get and how much they burn. A cup of kibble a day is going to be way too much for most Yorkies. If they are too big for their frames and reducing food intake while increasing exercise doesn't work, then they'll need a veterinary diet for this. The vet should tell you how much to feed because each one is going to require something different. There is a formula that can be used that takes energy level into consideration. I don't have it in front of me though. For an altered pup, it is probably very roughly about 30 cal/lb/day. Less on a diet...
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