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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
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Rex LOVES to lick the carpet! He usually does it under my desk or beside my closet, not totally sure why he enjoys it but he isn't ripping up the carpet so I usually let him. It probably has something to do with grooming since he almost always does it after he gives himself a nice groom!
As long as your bun isn't tearing up the carpet or ingesting anything harmful (as CinnibunMom said) I don't see why it would a bad thing. You could redirect his attention with some potted grass or toys if it seems to be harmful to his health or your carpet.
Lola licks the carpet and is very partial to grooming the microfiber couch AND *awkwardly* the zipper of my boyfriend's cargo pants. but only his cargo pants. maybe i'll catch her in the act tonight and post an awkward bunny photo. on second thought, my boyfriend would probably leave me....
ETA - she also likes to lick the sliding glass door lately - i think it has to do with the cold thing too. gosh, buns are so weird.