Our new little rescue is almost 8yrs old. He is a pudge at 15 lbs

The vet that saw him prior to adoption said his ideal weight should be no more than 11lbs and to only feed him 1/4 cup 2x day. I am currently mixing the wellness he was on with TOTW to transition him. I felt very bad this am after feeding him because he acts as though he is starving. Standing on hind legs and barks like crazy at me. I did steam some fresh green beans today for him to add to his food as a filler. I am going to pick up some raw baby carrots as well. I am looking for other ideas for other low cal veggies to help fill my little boys belly.