Im not to sure what to say, I have only had females. But it does seem to look abit big and I don't know if just the picture but in the last one it looks like there is a small lump. I would pick him up and check to see if anything else seems off. Just because he seems ok he might not be, my girl before she passed was diagnosed with edema and she would swell up like balloon but she still ate. Wasn't till the last about a week and half she stoped eating before she went. I would do a quick visual checkup just to be sure.