I had the same with my chihuahua when he was a "teenager". He went from being a little ball of fur to a lanky, cat-like creature with oversized ears. Cue a hamplanet "pet expert" REEEEEEEE ing how I need to feed him MOAR. Bitch, as if I'd take feeding advice from a woman who weighs 150+ kg and thinks she should eat 2000 calories with her completely sedentary lifestyle.