Dr., you may be seeing skin that became unhealthy and infected underneath the matting (a focal pyoderma) while Zebbie was kenneled or perhaps an early pyotraumatic dermatitis ("hot spot"). In either case, lavaging the area with chlorhexidine twice daily would be smart. You can also apply a topical antibacterial ointment such as mupirocin or if you prefer a systemic antibiotic in the cephalosporin class such as cephalexin at 20 mg/kg twice daily for a minimum of 10 days.
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I can be more accurate for you if I can see what you're seeing.
Thank you for the photo. It's consistent with pyotraumatic dermatitis. I'm surprised that he isn't still bothering it but that'll allow it to heal quickly. If he does begin excoriating it, a short course of prednisone dosed at 0.5 mg/kg initially and tapered over 10 days should be helpful. Please continue our conversation if you wish.
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