If he likes any kind of low carb treat, a specific toy, or being petted or groomed, those can be used as positive reinforcements for shaping desired behaviors.
You start by rewarding a small step towards what you want him to do, then make small extensions to the behavior every week or two.
Ex
- allow his ears or paw to be massaged; give low carb treat
- allow his ears or paw to be massaged and held for a minute or two; give low carb treat
- increase the time; give low carb treat
Etc