Within the canine world it is used to treat dogs with an enlarged prostrate gland. Any dog who has not been castrated will have an enlarged prostrate gland. This can often give it problems with urinating.
Some older dogs cannot be castrated because they may not be strong enough to withstand the operation.
It has to be repeated every two to twelve weeks and therefore is not a permanent solution (the effects are reversible) however, this does mean that it can be quite expensive to use on a regular basis. It can only be adminstered by a vet.