Quote Originally Posted by Jay_Bunny View Post
It may have been something with their genetics, maybe a defect you can't see. 11 months old is pretty young for a rat though. Have you introduced any new rats to the colony recently or changed anything with their environment?
No they been fed same food Kent for last 6 months and been fine. Freshwater daily and use pine pellets since day one. No clue but if another dies on me something is up big time.