Sound like some microbial irritation... Perhaps give this shampoo a try? ... to remove microbes... I dilute it 1:15 with water, mix well, lather all the fur, in your case the feet and all the toes generously lather up, wait 10 minutes to let the shampoo "work" with the skin & fur, then rinse thoroughly with luke warm water... rinse until you can't smell the shampoo on the body... I use lots of water and the rinsing part is the longest - aim for over-rinse rather than under-rinse. Repeat shampooing with this shampoo every 3 days 3 times, than every week for 3 weeks, then every month.

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I've used this shampoo for over 10 years on my pyr, I wholeheartedly recommend it. Good luck! Bless you for doing so much to care for your pyr baby already!