Epsom salts have been used to treat abscessed nail beds and paws that are itchy due to allergies. Use 1/2 cup of epsom salts per 1 gallon of water. Soak the affected paw(s) for 5-10 minutes, 2-4 times a day. It will help 'draw out' the infection in case of a nail bed abscess. It will also give the pet temporary relief from the itchy feet secondary to allergies.
Do not allow pets to drink an epsom salt solution since it can cause diarrhea.