You could try adding just a touch of plain yogurt to the food. Not even a teaspoon, just enough to give it a tiny bit of flavor. I have to give my large dog a heaping tablespoon of plain yogurt to his food twice a day because he has recurring urinary issues and this has made it so instead of constant infection he gets rare infections.
Anyway... my Yorkie was always trying to get to his food because of that so I just wipe the spoon into my yorkies food after I feed the big dog so the yorkie loves to get a treat with about a dozen pieces of his food covered in a trace of yogurt twice a day now.
Most dogs love the flavor of the yogurt. Because of yorkie sizes though I wouldn't give them a lot of it where my 80 lb dog gets a lot more than my yorkie does.
This would be much better than grease for the dog.
__________________  It's raining Yorkies here! LOL Teek  ,Rowan  , Raksha (Grand Puppy)  , Raelyn  |