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Use Listerine, amber colored only, for itch. Make sure you get the feet entirely wet along with body parts. It can be used on livestock and pets safely.
I had a Golden Retriever who developed welts and hotspots from flea bites and had a Labrador Retriever who had skin dermatitis. The following are some tips for you to try that have helped us (once you've eliminated mange, or other bacterial skin issues with your vet):
Determining the cause of the itching is the first step in helping a dog that won't stop scratching. This is a page about a dog that won't stop scratching.