It's called Symmetrical Lupoid Onychodystrophy and our dog has it. There's no 100% diagnosis without removing a toe but she has been diagnosed by symptoms and she has it all right. A couple of months ago we noticed a toenail loose. We figured she caught it on something and took her to the vet. He removed it but by the end of the same day she was limping and had another one coming up. I did some research and everything pointed to this autoimmune disease. There is no cure-only management. She has since been put on fish oil, vitamin e, tetracycline (switched to doxycyline for ease) and niacinamide (vit B3). She has lost all but one nail but the last few have appeared to have been painless and the therapy should help as they grow back. For a while she just lied about and never played (she is a lab mix so this was totally out of character for her) and seemed depressed but now she his back to her old self. Here is what her feet looked like a couple of weeks ago:
Her front feet-at this time she had one nail left which had been clipped short because it was twisted and hurting her:
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http://img.photobucket.com/albums/v8...daisyfront.jpg[/img]
Her back foot (only was able to take pics of one)
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http://img.photobucket.com/albums/v8...daisyrear2.jpg[/img] The center two nails are lifting-they come straight up like the hood of a car.
Same foot, different angle:
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http://img.photobucket.com/albums/v8...daisyrear1.jpg[/img]
The nail at the bottom of the pic was, at the time, the most normal nail she had. You can see how the others are lifting up compared to the "normal" one.
Since I took these, like I said, all of her nails except one have fallen off. The remaining nail is just barely hanging on. Here is a link with pics of a different dog, but his nails look just like our dog's did.
http://blackschutzhundshepherds.blog...al-lupoid.html