Tried to, but they wouldn't let us because we had an intact dog. I don't neuter my dogs until they reach at least two years of age for health reasons. I had no idea that me doing research and making an informed decision to do what's best for my pets would prevent me from ever being able to rescue a dog and give it a wonderful, loving home, but there you go. Good luck.
P.S. Sorry to let my bitterness shine through like that, but it was a very discouraging experience. They're great dogs and we would have loved to adopt one.