Right now we feed my older gelding Purina equine senior but I've heard it isn't the best, we get our feed directly from Phillips feed distributor(as we own a business and sell pet supplies) We get the equine senior for only 12 or 13 a bag, but we may be able to get dynasty or sentinel from them as well. If we are able to get them should i switch him to one of them? or keep him on the Purina, i'm not happy with his current weight so I'm looking to feed him something that will help to add some lbs, i've also been adding beet pulp, alfalfa pellets and rice bran to his feed to help keep his weight up...oh and he is lacking in the tooth department so he needs a grain that will turn to mash easily(which from what i understand most senior feeds soak well)