Many pet owners take their dog to a professional groomer and others try to clip and maintain their dog's hair coat themselves. If you are looking for a good pair of clippers, choose one that is durable. Many pet owners want a shorter coat for the summer and other pet owners do a full grooming.

This is a good quality hair clippers , not the cheapest but I've had good luck with it. The cordless ones are also nice and convenient as you can more easily take them to your pet

An article that might also be helpful to you is Grooming Your Dog.