My 7 month old Tea Cup Chihuahua started showing signs of being sick two days ago, by being listless. Last night he began to cough, had trouble breathing and diarehea. I immediately took him to the emergency vet hospital where his prognosis was extremely poor. His temperature was 93 his heart rate was 40 and was beginning to have convulsions. At first the Dr. thought it was viral, but all tests proved negative. They gave him different medicines and intravenous, unfortunately, we had to put him to sleep three hours later, because he was suffering. The Dr.s do not know what happened and we would like to know. He was kept in a clean environment, never outside and everything was constantly sanitized. Does anyone know if this has happened before. We are hurting and wish to know what happened to our bundle of joy.