He Won't Eat Dry Food With Nothing On It:

Weight loss practically SUSPENDS the advancement in arthritis in dogs - HOW? They only live 15 years. It takes twenty to become arthritis-damaged (and they won't) IF THEY STAY LEAN. Is your dog "fat"? NO ABSOLUTELY NOT. But they're at least 15% overweight or you wouldn't even be getting this note. I'm sending feeding notes but here's all you do:
1/4 kitchen cup level given, per fifteen pounds you WANT the dog to weigh. And they'll go to that weight. ###CRUCIAL###
Feed only plain DRY dog food SERVED absolutely dry nothing not even water on it - TWICE a day.
So simple. But lots of people say their dog won't eat dry food? Yes they will. I swear: Suspend food for TWO FULL DAYS* and they'll run over to a bowl of dry food and eat like it's ice cream - no matter how Princely or Princessy they've trained you to feed (spoil) them hahahahaha.

All that to say this:
1) Fasting for two full days if their Leptin level has crushed appetite for everything but canned food or hand-fed chicken, melted peanut butter drizzled on ice cream and ground beef. (Lots of dogs)
2) (Twice a day) Dry food served dry nothing not even water on it. Rachael Ray and "Chicken Soup for the Soul" (Amazon) and Costco diets are all good, surprisingly trustworthy, and affordable quality diets.
3) Cut treats to a minimum and no tablescraps.
4) Twice a day, MEASURE #in actual kitchen-gear#: ___________________.
The desired weight for this dog is: _________
You won't believe the increase in activity, enthusiasm, mobility and health.

This is one of the foods I like the best for my own dog Ajax. It combines a good price, home-delivery, a healthy formulation with moderate taste and calories and delivers a good clean poop. Careful though: The bags look similar even though pellet size and age-to-feed differs. You could end up with a bag of large bites for your Yorkie. Chicken Soup for the Soul Turkey and Brown Rice.