Agree with what’s been said so far, it really depends on the bun. Some buns have tons of problems, other’s never need to see a vet a day in their life.
As with dogs, poor breeding can lead to problems. Dental problems are especially common in netherland dwarfs, lops, and seems like lionheads are joining the ranks as well.
Many of the common issues can be avoided with good diet (lots of hay!). Hay is good for the teeth and important to keep the gut healthy. Good grooming practices also prevent fur-induced stasis. Healthy activity levels help with everything too. But then of course some things are genetic and will happen no matter how good the care is!
It’s a good idea to have a financial plan for anything that does pop up, and then hope to never have to use it. For example my Bertha lived to be about 11 (we think… didn’t know her exact age when we got her), and never had a problem her entire life, up until the very end. But then my Moose (who was only about 1 year old) had some congenital issues with his teeth, and had to be treated for a dental abscess plus molar extractions, and ended up passing away before he was 2 years old. So you really just never know!
It can also (but not always) help to adopt a bunny that is already a few years old, and who’s medical history you know. A young bunny (like a puppy), can be kind of a crap shoot because some problems don’t develop until well into adulthood.
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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.