He awoke as usual, jumped off the bed and went out to potty with the big poodles. He came back in a few minutes later and didn't want breakfast, which was not unusual. Within the hour he went downhill, became lethargic then laid down and quickly became unresponsive. We rushed him to emergency which is very close by, and they could not revive him. I was in shock to be arriving back home half hour later, with my boy lifeless in my arms. My vets agree he must have had an aneurysm. He was in great health, and had no signs that anything could have been wrong.