What you're describing doesn't sound good - take him to the vet asap. Another thing too about the Purina - not a good food... typically if they sell the dog food at grocery stores or stores like Walmart it's not a quality food. Try pet supply stores (but not pet stores) and see what they recommend or you can get a list from the Whole Dog Journal for approved pet foods. The first ingredient should always be a meat protien and have no by-products in it at all. Keep us posted on Reese and what the vet says. I hope that everything improves soon.