Cotton was spayed in May and her fur is back about 85%, Penny was spayed in July before I got her and her spay area is about 60%. The incision line grew hair back first- so she had a bald rectangle with a line of fur in the middle. And Penny’s appears the same way- it is the outer edges of prep area that is yet to grow in. My personal theory is that the bunnies body recognized the incision as trauma and set to healing it and regrowing fur (as they would for a wound in the wild)- but the body did not recognize the shaved area as a trauma and the body does not prioritize growing fur back on the shaved area- so it seems as though it takes months and months for that part to grow back.
My vet did a double take when he saw Penny’s belly at her exam when I got her- but I explained Coton did the same thing after spay. Dogs and cats definitely do not behave like this. And for the bunnies that we spay and neuter, if we use sutures and not glue- we see them back in 10-14 days so it is typical not to see the hair not grown back in. We never see bunnies just months after spay/neuter- usually years as there are no annual vaccines for bunnies although we do see some older ones yearly.
So keep an eye on Boston- I would not be surprised if her hair does not grow back quickly except for incision site. And that will probably be the same for her leg too- if they had to do bloodwork and IV they had to have a sterile site for the catheter and I am sure they were taking no chances with all poor Boston has been thru! Maybe the winter weather will trigger her body to grow hair back sooner!