itchy rabbit

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Our male bunny,Twinkles the grey one with his mate, a brown one resting on his neck, in the rabbit pictures,suffers from itchy skin on the sides of his back legs and above his tail. Last time he was at the vets,the vet said that he was fine. Twinkles loves when I scratch his back and sides. I notice he is always trying to reach those spots. Any ideas how to help him ? Thanks in advance for your input