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Hi there, would you mind please describing in more detail what you're seeing in Artir's nail beds?
Does your backyard have grass that produce foxtails? The small sore that I am seeing in the photographs looks very suspicious for a foxtail that might have embedded itself in Artir's paw. Foxtails are very sharp, and are known to embed themselves in the paws, noses and ears of many of our companion animals that go outdoors. Poor Artir, I would suggest that you take him to your veterinarian for possible foxtail removal(s). Your veterinarian will need to probe the area, possibly under sedation, then flush it thoroughly, and send home treatments like antibiotics and pain medications. The reason Artir's paws are turning brown is because he is licking them repeatedly, in an attempt to remove the suspected foxtails in the only way he can. Good luck, and I hope Artir's paws get back to normal soon after being treated by your veterinarian.