There were a couple of rolly-polly border collies at the parts: so round I probably could not get my arms around them. Most were pretty old, though. And all of them were love-bugs with master-lever food mooching skills (small surprise!). WRT your dad's dog, it probably more of an activity/food level thing. Unless she's really old, she needs a vigorous walk of several miles a couple of times a day PLUS some other activity (or "senior" dog food!). Then again, she could be stealthing food on walks-- that would explain the picking-at-her-food habit...