I know someone who would use a stroller to take one of her buns to visit a senior center as a therapy bun. He was super relaxed and would lounge in it. So I think it’s really rabbit dependent.
It does look like he’s not too stressed, but if you notice he seems exhausted after, he may not be enjoying it as much as you’d hoped. There is such a thing as “good stress”, which can be enriching, but of course we don’t want to over stress our animals or put them in danger. I think you could continue to feel it out.
Another good measures of how a rabbit is feeling is whether they will eat. If he munches on some hay while you are strolling, he’s probably not too concerned.
Another test of how he really feels could be to see how he reacts when you get the stroller out for a walk. If he runs and hides, he’s probably not a fan!
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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.