I’m glad you looked into a rescue. <3 Often with buns with medical histories like that, the rescue will consider them to be a “sanctuary” bunny with you, meaning they would cover medical costs related to known issues. That’s not always the case, but it’s something to mention. It’s really common for rabbits spayed late in life to already have uterine cancer though, and often they can remove it all and the bun does fine. I’m guessing it wasn’t very advanced since they deemed her suitable to be adopted out.
I’m glad you aren’t in an RHDV area, so you don’t have to worry about Ben. There really are so many things that can cause sudden death in bunnies 🙁
Also don’t feel you have to rush into the decision. As long as Ben is eating and pooping fine, he will be fine will you consider options. Some buns go into deep depression when they loose their mates, and the owner has to bring in another bun quickly so their original bun doesn’t go into stasis.
You might ask the rescue if they would allow you to foster a bun that you think might be a good match, and then only adopt if it’s working out.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.