I'm no expert but think, if he's getting plenty of exercise, you could give him a bit more. Humphrey 's younger than Bobby (18 months) and I've been giving him 2.5% but have now decided to give him a bit more as I think he needs it. Its trial and error really but if you're weighing him regularly, it wouldn't hurt to try a little more, if you feel he's putting too much on, you can always cut it back again. Another possibility is to add bulk - extra vegetables or fruit for instance, either cooked or finely grated/liquidized. As "reward" treats, I give bits of low fat cheese, chicken, sausage etc and as a snack I buy dried tripe (bit smelly though) or dried meat strips and he's allowed a couple of little biscuits.
Humph does luckily like carrots but he also eats pieces of courgette or apples, melon or banana which you can try.
I DIY it, as I can't get Nutriment etc here but do try and offer as much variety as possible as I think, rather like with us, the more different things the get, the less likely they are to have any deficiencies.
Hope that helps.
