They will gradually lose hair starting at the rump and moving forward as time goes by. If your hamster is losing hair before it is 5 months old you should consult a veterinarian. Salmonellosis is an intestinal tract infection that will require veterinarian help. The signs of salmonella is a ruffled coat, loss of appetite, and weight loss. The animal needs to be taken to the vet if these symptoms occur.
Symptoms are lack of activity, ears laid back, runny nose, sniffling, and sneezing.
Try not to handle your hamster if you have a cold but if it does get a cold make sure to sterilize all water and food bowls and keep the bedding real clean. Make sure there are no drafts on the hamster. Offer plenty of good foods and supplement them with cod-liver oil to help your hamster get over it. A bacterial infection that causes diarrhea, ears laid back, loss of appetite, and a fluid like discharge from the vent. The animals' hind quarters will appear dirty and wet.