Here at RWAF we are often asked our opinion on things like harnesses, clothes for rabbits and this week taking rabbits out in pushchairs!
It is impossible to cover every eventuality that owners might think up for their pet rabbits, but to try and cover as many as possible we would say that rabbits should be neutered and vaccinated, fed a hay based diet, and kept in compatible pairs and with 24/7 access to a large safe exercise area with a shelter. We recommend a minimum area of 3mx 2m x 2m high for two average sized rabbits, regardless of them being kept inside or outside. Supervised free range time in a safe garden or bunny proofed areas of the house are good in addition to this but should not be instead of.
There is no benefit at all to a rabbit, as a prey animal, to be dressed up in clothes, to wear a harness, to be pushed in a push chair, or taken on an unnecessary car ride at all, in fact they can be detrimental to their welfare by causing them stress, so we do not approve of these things.