Adorable bunny! In response to what someone said about wire bottomed cages, they are actually not bad for a rabbit's feet as long as they are given something to sit on and the wire itself is thick enough. I have both solid and wire bottomed cages and the only rabbits to get sore feet were actually the ones in the cages with solid bottoms. The wire is much more sanitary for the animal and allows air to get at the animal's feet.
Wire bottomed actually aren't better. As an experienced House Bunny care taker, I can confirm that it is better for rabbits to have solid bottoms. Furthermore, rabbits should not be kept outside if they are companions or pets. They can be bothered by the weather, wild animals, and stressed by the small quarters. You'll never see your rabbit develop to his/her full potential in sub-par living conditions.
Your solid bottom rabbits didn't have a bedding soft enough or you didn't keep the cage clean or both. In my country wire bottom cages are illegal and everyone lives in solid bottom cages, but even my 10 year old rabbits have never gotten sore feet.
Interesting, since my rabbits are inside and I clean their cages every second day to prevent any smell. I use litter boxes with blankets on the bottom of the cage. That's your experience. My point was not that solid-bottomed cages cause sore feet, but that it's ridiculous to accuse someone of not caring about their animals just because they think wire bottoms are "cruel".