
Percentage of the dog's dinner, Edam cheese is good 'cause it's squidgy so doesn't crumble, liver bread, tuna bread, boiled liver hardened off in the oven (yummy, so say the dogs, specially if you splosh the boiled water on their din dins), cooked chicken, hot dog sausages, Fish4dogs all stars, Barker & Barker little liver training treats and veggie treats (latter quite big and white so good if chucking on the floor). The possibilities are endless!
Just make sure that on days of heavy treat use, you reduce the dinner intake accordingly, otherwise you end up with well trained but very fat dog

If you do have a dog that is prone to weight gain, boiled venison is very good ... yes, my dogs eat far better than I do.
Some of us are lucky, I have one dog who will do ANYTHING for carrot ... sadly she's not the one prone to weight gain