Our cat is 4 years old. He has had the diarrhea for about 3 weeks now. It all started when we began to pack to move. We have a total of 4 cats. Mom and Da and 2 of their kids. Dad went missing about the same time as his sons diarrhea started. They are indoor/outdoor cats but we have not let them out at the new house yet...because, dad is missing and we wanted them to get used to a bigger house in a new neighborhood. The othe 2 cats have adjusted very well and have taken to the new home without any problems. Althoug they seem to all look for the missing member of the family.