Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you.
This could reflect a problem such as infection. The most common infection that leads to yellow and brown discoloration to the nails is a yeast infection. However, in dogs with this problem the dog tends to lick the nails a lot. The discoloration usually starts at the base of the nail where it goes into the skin and may extend out a few millimeters. I cannot say peeling is usually associated with this. If she is having a lot of licking of her paws, then I recommend you have your veterinarian check her nails and paws for a yeast infection. This will require a skin scraping to look for the yeast.
If this discoloration is not very dark in color but tan and the peeling involves the entire nail, then this becomes more suspicious to be an immune-mediated disorder called lupoid onychodystrophy. This is not a common problem and is highly difficult to contend with. It starts with the peeling and then progresses to the nails becoming brittle and cracking. At the point the nails break/crack they are quite painful. This can be diagnosed by your veterinarian doing a biopsy, but this is not necessary if the nail look to your veterinarian to be lupoid onychodystrophy. Treatment is very difficult. There is not a clear cut easy therapy for this. These patients must be started on high doses of omega-3 fatty acid (such as 180mg per 10 lbs of body weight) as a starting point. Some respond to a combination of tetracycline (or doxycycline) and niacinamide. This does not respond to oral corticosteroids. There are other drugs that can help.
Overall, if this is a progressive problem, and especially if the nails being to crack and be brittle, then she is going to need an exam by her veterinarian to work through this issue.
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