My white jack russell died a few days ago and am worried i did something wrong. He seemed fit and well,perfect weight and was 7 years old. It was a hot day so my two dogs were swimming. I left them after they got out for about 20 mins and got a concerned knock on the door. One of my dogs was laying in the shade with what looked like vomit around his mouth. I brought him inside but he was very limp. His breathing was shallow and his eyes, which were milky in appearance, flicked from side to side. he was still damp from swimming. his condition worsened and after about 15 mins had what looked like a fit and died. Is there anything which i described that can allow you to tell me what went wrong? Could i have done anything? Most people seem to think it was a stroke but was wondering if it could have been dehydration and/or heat stroke. I live many miles from any vet and don't drive. My other dog who is larger and black was fine.