Ellie's favorite is homecooked.
She eats anything though.
Canned food does cause loos stools in some dogs.
If you want him to love his food, then you will have to keep switching.
If you want to make him eat it, then just offer it for a couple days and see how he does. Make sure he isn't going into hypoglycemia though.
I prefer that (within reason) dogs enjoy their food and if they don't I would find another one.
There are just some dogs like Layla though that for some reason get the tastiest food and don't love to eat all the time.