A. There are several possible answers:
1. Your chinchilla could be priming. Priming is when the chinchilla gets new fur. This process first happens around 8-10 months of age and then a few times a year for the rest of the chinchilla’s life. During Priming, you may see little pieces of fur sticking up all over your chin’s back. You can comb your chinchilla if you’d like to help get all the dead fur out; you’d be surprised how much will come out.
2. Your chinchilla has slipped fur. As a defense mechanism, chinchillas are able to slip (or lose) their fur. If a predator is trying to catch a chinchilla, the chinchilla can slip fur and the predator is left with a mouthful of fur and the chinchilla can get away. Fur-slip can be a little amount or a lot. You can tell if the fur was slipped because it will have a white tip to it indicating it was live fur as opposed to solid grey. If your chinchilla has a bare spot of normal skin, this is a result of a larger furslip. The fur will grow back but takes about 3 months. Fur slipped from a tail takes longer to grow and can happen if your chin is trying to get away while your holding the base of his tail.
3. Your chinchilla or a cage mate has chewed his or her fur. Fur chewing is hereditary but can be caused by environmental stress or poor nutrition. Sometimes a chinchilla will chew in cycles, or only under certain circumstances and others will chew continuously. A theory is that boredom brings on fur-chewing so make sure your chin has toys to chew. Do not breed fur-chewers.
4. If your chinchilla has fur loss with red irritated or dry scaly skin your chinchilla probably has fungus (ringworm). You will need to isolate the chin from any others you have or treat all of them since fungus is easily spread. It is easily spread to humans and other pets as well.