If they are too long, the rabbit won't be able to eat properly, and they will have to be filed. However, bunnies NEED to knaw to wear down their teeth. Wooden toys, hard treats - even seed ones, sticks from certain trees, maple, popple - (Untreated wood, twigs and logs that have been aged for at least 3 months. Apple tree branches can be eaten fresh off the tree. Stay away from: cherry, peach, apricot, plum and redwood, which are all poisonous.) see http://rabbit.org for more. Untreated wood - scraps from a lumber yard, even ... Popsicle sticks from fruit-flavored popsicles are gnawable ...