My cat needs to gain weight, I took him to the vet and he is only 8lbs. The vert said he needs to put weight on but didn't say how he should do this or how quickly. Right now I have started feeding him some soft food once a day and I am thinking maybe of changing that to twice. I am afraid that he will put the weight on too quickly and make him sick. Does anyone know if he will get sick if he gains too quickly or should he be ok? Help please