So a while back one of my female rats died from mammory cancer, then five days later her 8 month old son Roly-Poly died. They were not kept together. The son had a cold, but was recovering when he suddenly died. I assumed it was a complication with the cold. A week ago I found a lump on my rat Piglet who is 14 months old. She has never bred and she is kinda deformed. Her backlegs are kinda messed up. She was the runt and her mother refused to nurse her so I bottle fed her. Her mother is 3 years old and also has mammory cancer. I took both Piglet and her mom, Blackie, to the vet. Vet said to just let Blackie go until she cant go anymore and then have her put down. Piglets lump was not cancer, but an umbilical hernia. Vet gave me antibiotics to give Piglet in preparation for surgery. Her surgery is Thursday. She died last night. I always triple checked the antibiotic dosages, so I dont believe it was an overdose, specially since she has been on them for about 5 days now. She was acting fine the night before, playing and such. She lives in a one level cage because her back legs sometimes don't work and she cant climb very well, so I dont believe she fell or injured herself. She has no physical wounds. She just curled up and died. Any ideas what happened? 3 rats have died in as many weeks! One I had put down from mammory cancer, but Poly and Piglet were young. And Piglet seemed healthy beforehand.