Altering rabbits can reduce hormone-driven behavior such as lunging, mounting, spraying, and boxing. Spaying females can prevent ovarian, mammarian, and uterine cancers, which can be prevalent in mature does. Unspayed does have an 85% risk of getting a reproductive cancer, especially if they are five years old or older. This risk is virtually eliminated by having your female spayed. Neutering bucks will not only prolong his life, it will help eliminate hormone related fighting and aggression. They are easier to litter box train and they seem to stay trained. Most vets feel comfortable if you bring your pet in when it's about 6 months old (males can come in about 5 months). If you think your rabbit is too old to be fixed, bring your pet in to be checked out. Usually vets have a cut off line at about 6 years old, but your particular vet might feel differently. PRIOR TO SURGERY: Rabbits should be in good health. If your rabbit is over 2 years of age, or if you are unsure, have her examined by your vet. It's recommended to have blood work on rabbits over 2 years old to check kidney and liver function. DO NOT remove food and water from your rabbit the evening before surgery. Dietary changes can upset your bunny's stomach, making postoperative recovery harder on them. AFTER SURGERY: Make sure bunny's cage is extra clean. Check incision daily for swelling or discharge, and to be sure she is not chewing or pulling at her stitches. Encourage bunny to eat. Offer her favorite foods, fresh hay, etc. If she has not eaten within 12 hours after surgery, if she appears to be overly uncomfortable, in a lot of pain (gnashing or grinding teeth, etc.), or if there is any discharge, bleeding or swelling around the incision, call your vet immediately. We usually wait about 24 hours before allowing a bunny limited out-of-cage playtime. We don't want her jumping or getting too exuberant, but limited exercise for about 3-4 days is good both physically and psychologically