I really felt great during those years, but I was very skinny and had a hard time keeping weight on. (rawsomehealthy.com)
For example, a customer might seek treats or supplements appropriate for an older dog that needs help keeping weight on. (petbusiness.com)
Male dogs can be hard to keep weight on as they go through adolescence (age eight to 18 months) but females don't seem to be quite as extreme in that regard. (justweimaraners.com)