Sometime it happens due to hard and rough surface. Use some oil like pure coconut oil for gentle massage and give proper supplements which are rich in
Vitamin A and Zinc.
Next Steps
Gentle Oil Massage at Hardness area of paw. Checkout the some activity which will change in behaviour of dog where use excessive scratching the surface or soil home hard surfaces. And provide those minerals and vitamins which are essential for skin and nails like
Vitamin A and Zinc especially for better condition. Thank You.
Health Tips
You must focus on cause of this condition rather than just condition. 99.99% it happens due to some harsh activity of the pet. So checkout behaviour and activity for permanent solution of this.