Has your Sheltie ever caught a case of the zoomies while on a leash? Zulu & I were out on our morning walk, and he decided that it would be a good time to get the zoomies. All of the sudden he took off running, jumping, spinning and barking at the end of a 3 foot leash. Then he suddenly lays down in that "lets play!" pose. It must have really looked strange to see man with a dog going nuts at the end of a leash. I was finally able to get him to sit, and after brief "time out", we went on our way. Glad he was able to get that out of his system all at one time!