Molting is when rabbits lose their coat and grow in a new one. A molt can last from 2-6 weeks or more. It varies greatly from rabbit to rabbit and from breed to breed. During this time, they can get a hair ball that can plug them up. Giving hay daily will help this, but when one gets into trouble, we give them a little bit of dried papaya or fresh banana or even a little fresh pineapple. In the spring and summer time, a dandelion leaf or two is a special treat for them that they seem to really like. All of the above seem to help get their system going again.