I’m happy to say your vet is incorrect (most likely)! Not all vets have a ton of knowledge on rabbit behavior, unfortunately.
Feet circling and nipping is an “amorous” behavior, male buns will do this to female buns when they are preparing to mount. So he loooves your feet. LOL
So I would say just hang in there and wait till his neuter. Wearing thick socks or slippers will hopefully make it more tolerable. It may take a few weeks for the behaviors to calm down while his hormones settle.
As for chewing the cage bars, sometimes it helps to add a visual barrier, so you can try clipping a towel or a blanket over the cage wall that he tends to bite.
Does he use his chew toys? If not, it prob means you should try a different type of toy to find one that he likes and will use. Organic palm plates are very popular with my bun that is also a cage-biter. They are the one thing that gets him to stop obsessing over biting the bars (mine also does it when the pen is open). 🙂
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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.