Fleas are dangerous in rabbits because they can quickly
grow in numbers. Fleas survive by sucking the blood of its
host, in this case your pet rabbit. If left untreated the
fleas will multiply in a matter of days.
Fleas can easily be transmitted between household pets.
So if you have a cat or dog which has fleas it is likely
that your rabbit will get them as well. Also, multiple rabbits
housed together are likely to contract fleas from one another.
There are a number substances available at your local pet
store that will do well to rid your rabbit of the fleas.
It is important to not only remove the fleas from the rabbit
itself but also to thoroughly clean its enclosure or you
run the risk of the infestation starting up again as soon
as the rabbit is reintroduced.
You will also want to take a look at the source of the
flea infestation. Usually they come from unsanitary living
conditions for your rabbit. If this is the case you are
advised to keep your rabbits cage cleaner in the future
to avoid fleas.