I took my two dogs to the doggie park today as we do every weekend.and have for a few years. The Dachshund loves to go and just wander around. It's made him a lot more social. Ziggy, the Boston/Sheltie mix is the ball boy of the park. He's even been featured on a calender, because he makes spectacular leaps and catches balls 5 feet off the ground. He goes full out the whole time as he did today. Husband was using a ball launcher and Ziggy was racing. Then most of the small dogs went to the fence and chased the big dogs racing back and forth with Ziggy leading the pack. It was 60 degrees. Ziggy came over panting like mad and then staggered and laid down. We gave him water and he was panting and unsteady on his feet. We made him lie down and then husband held him on his lap. After five minutes, Ziggy got down and ran over to get the ball which of course we didn't throw. He's four years old, a rescue , and in perfect health and weight at around 25 pounds. He's all muscle and goes on a three mile walk every day. He's perfectly normal now, ate his dinner, begged for more, and slept on his bed as he does every night. He's sitting beside me now with a ball in his mouth. >>This scared me. I thought he was having a stoke. He's scheduled for his annual check up this month. Any ideas of what happened.. Pure exhaustion?