I have noticed that Dragster is getting muscle spasms right behind his shoulder blades.We play ball everyday almost so he's getting exercise. I thought they would pass but he hasn’t seemed himself. I gave him a massage and he seemed a little tender in certain areas. I can tell the spasms are irritating him because he will get up and look at the area the best he can since he cant reach. Any ideas before we call the vet? Hes not over-weight really.. hes 30-32 pounds.