I give mine enough food to retain what is lost when running. So if your boy is running less, wont hurt to feed him less.
I give all mine some breakfast too - so if you give any, maybe cut that in half and divide his dinner up. 1/2 morning 1/2 nite. May help.
Good Luck with him
I actually got just a pup of mine home form rearers a good 3kg+ over weight. I wanna get him down ready for breaking in but i reckon by the time i slim his fat ass down, itll be retirement time lol.