My dog has put on weight & has a fat roll around her neck. Not sure if it is just substaneous fat or could be a lipoma or something else. It feels spongy. We will take her to get checked out. She is on antinol for her joints and is happy and eating but a lot of the time doesn’t want to go for a walk. Not sure why that is, she was caught in the hail once, so now sure. Any thoughts?