I was worried about Gizmo's weight too, so when he went for some of vaccines I asked the vet. Her words to me were that he was slightly underweight, and if he was to get sick, there wouldn't be much there to sustain him. So, with vet approval, trying to put a little more weight on Gizmo which has been working.
My suggestion is if you plan on seeing your vet anytime soon, just ask him/her and see what they say. |