Heidi, a four-year-old continental giant rabbit, from Dorset has had sessions in a heated pool while wearing a life -jacket.
Hydrotherapy pool owner Linda Prove said she was sceptical when a vet referred the rabbit, but the treatment was "working incredibly well".
Heidi's owner Amanda Williams, from Christchurch, told the BBC that her pet took to it like a "duck to water".
Heidi, who weighs about 7kg, had been diagnosed with arthritis in her hips and knees and spondylosis in her neck.
While rabbits can swim in the wild, Heidi wears a buoyancy jacket during the sessions and is carefully dried afterwards to prevent hypothermia.
Williams said: "None of us thought she would tolerate even one minute in water.
"She is certainly a lot more lively and is obviously benefiting from this treatment.
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