Fur loss

Molting
Molting is a natural process that occurs 2-3 times a year where a rabbit sheds his entire old coat to expose the new. Bald spots are common at this time. Owners should regularly brush their rabbits to minimize the amount of hair that the buns can ingest to prevent hairballs and GI stasis from occurring.

The links below provide more information about molting.
 * San Diego House Rabbit Society, When the Fur Flies