I rescued my rabbit about a year ago and assume he is about 2-3 years old at this point. When he was found outside, he had 30+ ticks, an infected wound, and needed a surgery. He is doing great now, but he is my first rabbit and I get worried because of his medical history. What can I do to prevent disease? He has unlimited access to water and hay, eats primarily pellets, and occasional greens. I am going to switch to give him more greens, but other than that is there something I can do to keep him healthy. Are there any supplements that are beneficial?