Tuna bread?
Very easy to make. This is how I do it:
Tin of tuna in olive oil
Dollop of flour - probably 1-2 tabs
One egg
About a tsp of garlic powder
Mix together. Spread onto a medium dinner plate and microwave for 4 mins. Remove and cut into small pieces.
Will freeze too

I usually put the treats in the oven to crisp up for a bit, but if your dog has poor teeth, these will be fine just microwaved

Never met a dog that didn't like tuna bread

Livercake is another one that he might like:
Recipe here:
http://www.hearingdogs.org.uk/news/the-dog-blog/liver-cake-recipeThis recipe makes a hoooooge quantity though - You could do a third of the quantity which might be more reasonable!
