good... they have such funny bodies i often find it hard to gage. i feed them a pretty good diet, low in fat and protein... and hardly any sugary treats, so i never thought they might be fat. i suppose i worried because they tend to be so "non active" ... whenever i let them out for a run around, they usually just explore for a bit and then they find a good place to sit and sleep. they're about a year old... and i've had them with me since they were tinny... but i'd never had rats before them.
Cowboy looks just a tad bit chunky but not too bad (has wee little man boobs starting). Can't really make out the other guys but they definitely don't look like they are under weight <wink>. BTW, very handsome guys!!
Best thing to do is weigh them & try to get them to be a bit more active.
Over weight is never a good thing for anyone & inactivity isn't doing them any favors either.
I'm not saying.... bad bad, do something quick... now would be a perfect time to get the guys physical & see if that does the trick.