[Jenn H]

Sometimes adding warm water to dry makes it more enticing.
Every dog is different. They may not like the same food or are sick of what you feed them. Sometimes they know something isn’t right w/ the food and won’t eat it.

Why do you not want to mix it with wet? Wet is little more costly, but better than dry food.

I’m assuming your dogs are otherwise healthy. It’s weird that a Lab won’t eat something. That makes me suspicious.