Toe amputation is very common when breeding chinchillas.  This is caused by other chins biting toes through the wire mesh cages, when being introduced. Most injuries are quite visible, but those which are not, such as bites on the body, hidden by fur, can be problematic.  Blood in the cage is usually the most common symptom.  Fractures are very common, and the affected leg may often be seen hanging at an awkward angle.

Possible Causes

Usually another chinchilla (or other pet) is the main culprit.  Unsuitable or very tall cages can increase the risk of fracture, however chinchillas are more prone than many other pets.  Always check the suitability of caging, hay racks and hanging-toys.