I can’t help but wonder if maybe they get a lot of food during the day (dry and canned mixed, AND treats)? I know that some dogs become less motivated to switch back to kibble if they get a lot of food, or the kind of food they are used to (wet vs. just dry). And while I am a huge proponent of feeding moist food all the time, while implementing some of the great advice above, maybe you can think of whether you could find interesting ways to feed just kibble by putting it in a treat-dispensing toy such as a Kong (Wobbler), a Barnacle, or some sort of interactive toy/puzzle for dogs. For my dog, I do this once or twice a week, and sometimes, I just scatter his portion of kibble all over the floor and let him go all over the place to eat it. Lucky for me, he is very food motivated, and would eat just dry from his bowl at feeding time if I served that (I’ve tried). So you can try to introduce some interest by putting kibble in some toys and seeing if it works.
Also, if/when you do training, you can use kibble as treats and feed them their portion, or some of it, during training time. That works for me too.
But do try to stick with wet kibble (even with just water or chicken broth), it is much better for the dogs for the reasons other stated above. 🙂
