Plus as karlin said about fussy eaters, harley would turn his nose up and most dog food, and not eat half what i put down for him, because he knew he could tank up on treats and left over else where. It was a tough wake up call, but when your told the operation your dogs need wont be done until he loses weight then you get on and do what you should have done months ago.
So..... no treats, no leftovers, get him weighed so you know exactly what your up against and get it logged so you can see how your doing. Next get some high quality "light" food should as, royal canin, james wellbeloved, arden grange, skinners, they all do a diet version, some will send you a sample if you email them. Harley has 35grms twice a day, which is nothing, such a tiny amount but it takes them several weeks to learn thats all they get, take it or leave it. Harley lost nearly a kilo in the first three weeks, because he wasnt eating much at all. You can add veg, and goat yoghurt (tesco) with some oats. Plus get a rota for walking, try and sort out places you can go with him, like boot sales and canal paths, youll be amazed when you look round at things you can do that involve dog walking as well. Harley is neuteured too. di