We rescued a 20 mnth old blk lab mix a little over a mnth ago. He is very skinny. We feed him in the a.m. And p.m. And a less amnt through out the day. We also give him rice mixed in with his food. He has A lot of energy and loves to play fetch. He was chained up for a number of months with no human contact for mnths so we talk him on walks A lot. He is hardly ever chained up. My question or questions actually: what can we feed him to help him gain weight and should we limit fetch and walks?