My dog has lost a considerable amount of weight. He is currently being fed a high calorie diet to boost his weight, but has only been able to maintain his current weight. We have taken him to the vet five times and they have run several tests all of which have come back negative. The costs are staggering and we were referred to a specialist who wants to run all of the tests that have already been performed within the last 3 to 12 months. I can understand redoing a couple, but having every test redone is going to cost almost $3500 before any additional tests are performed any suggestions?