David, what kibble are you giving Kaia? Murphy has been on K/D for most of his 3 years, and has done really well on it. I'm sure it must be more difficult for Kaia, since he is having to change from what he's used to eating. One thing I've done that has worked so nicely is to also buy the canned K/D and cut it into cubes, and also sticks to stick in Kong's, and then freeze it. He thinks it's a special treat. He will, from time to time, get really tired of his kibble and let a day's dish sit pretty much untouched. When this happens, I thaw some of the frozen, mash it up and mix it in.....presto, empty dish!
I'm sure you've been told no commercial treats, or rawhide. Murphy has a marvelous collection of Nylabones, in various stages of hard usage. You can also buy dog bisquits (usually at your vet's) that are complimentary to the low protein diet. Murphy loves those.
I also give him snacks of mini carrots, lettuce, and cucumber slices, which he loves. Just remember never to give him beans of any kind. They are really high protein!
-----
Anne, Bill, and Murphy
Brrrr!