Dogs grow hair between their toes and foot pads. The softer coated dogs are more likely to form mats in the foot area. This mat is a clump of hair that gets stuck together and can trap in dirt. It can be very uncomfortable for your furry friend to walk with a mat between his toes. It would be like walking with a rock in your shoe.
You want to keep the hair around the foot area trimmed and you can do this with hair scissors. Simply, trim just a bit at a time. Hold the paw out in front and trim the hair you see sticking out between the pad. You do not need to trim all the way down, nor do you need to do all four paws at one time.
If you find mats while checking your dog's paws, I would have them removed by your groomer.