Safe wood

If you are planning on making your own rabbit cage, toys, or just letting him roam around, it is a good idea to know what wood your rabbit can and cannot eat. Most untreated wood is okay, but some kinds of untreated wood can still be toxic. For example, cedar , even if untreated, contains harmful oils that can lead to kidney disease in rabbits.
Safe woods include:
Apple
Birch
Blackberry
Hazel
Hawthorn
Maple
Pear
Raspberry
Willow

• Juniper
• Poplar

Stay away from:

Apricot 

Birch

Blackwood

Cedar

Firs

Juniper

(Freshly Cut) Pine

Cherry

Spruce

Walnut

 If your rabbit's cage is made out of wood, check to make sure your rabbit cannot get to any glue or insolation, etc. Your rabbit should not be chewing on its cage that much. Be sure to provide a steady supply of toys in order to prevent chewing on things such as the cage.