Healthy rats are active and interactive pets, and they breathe without effort. A healthy rat has a clean nose free of discharge, and droppings in the cage are firm and round. A shiny coat is a good sign that a rat is well cared for.

A number of warning signs indicate that a rat may be unhealthy and in need of vet care. The following signs all warrant a trip to the vet:

• Pale eyes
  
• A dull coat
  
• Lethargy
  
• Aggression
  
• Wheezing
  
• Diarrhea
  
• Patchy fur or bald spots