The following double-coated breeds require very specific care that you need to be aware of:
Herding Breeds: German Shepherd, Australian Shepherd, Rough Collie, Belgian Sheepdog, Briard, Beauceron, Bouveier des Flanders, Old English Sheepdog, and Border Collie.
Mastiff Breeds: Tibetan Mastiff, Leonberger, Great Pyrenees, Saint Bernard, Newfoundland, and Bernese Mountain Dog.
Spitz Breeds: German Spitz, Finnish Spitz, Akita, Korean Jindo, Shiba Inu, Alaskan Malamute, Chinook, Siberian Husky, Alaskan Husky, Norweigian Elkhound, Keeshond, Samoyed, American Eskimo, Finnish Lapphund, and Pomeranian.

The care of these coats can be very simple, as long as you follow specific care requirements in a timely manor.
1. Shedding Season (winter)
2. Shedding Season (summer)
The undercoat needs to be removed as it sheds to make room for the new winter/summer coat.  If the shedded hair is allowed to sit in the coat too long, it does not allow proper insulation to the skin which often causes: dandruff, itching, excessive shedding, matting, hot spots, and even hypothermia/hyperthermia.   Because the skin oils cannot properly coat the topcoat, the dog's topcoat becomes dry and brittle and is prone to breakage.  Without the natural oils, the coat also picks up dirt and other pollutants resulting in a dirty smelly dog.  If properly cared for, double-coated breeds often only need to be groomed/bathed four times a year!

If you have a dog with a damaged coat, your care requirements need to be every three to four weeks until the coat is able to recover.  The following are the most common reasons for a damaged coat:
*Prior "shave-downs" or "summer cuts" (CLICK HERE for more info)
*Failure to remove the shedded undercoat in a timely manor
*Use of a "Furminator-type" deshedding tool (CLICK HERE for more info)
*Failure to maintain the undercoat in between shedding seasons
*Bathing the dog without proper drying (these dogs require the use of a high-velocity dryer) 

The following is the recommended grooming schedule should be followed for proper care of your dog's double coat:
COATS IN GOOD CONDITION or SHORTER COATS
*February - Maintenance
*April - Maintenance
*June - UNDERCOAT REMOVAL
*September - Maintenance
*November - UNDERCOAT REMOVAL

DAMAGED COATS or LONG-HAIRED COATS
January - Maintenance
*February - Maintenance
March - Maintenance
*April - Maintenance
May - Maintenance
*June - UNDERCOAT REMOVAL
July - Maintenance
August - Maintenance
*September - Maintenance
October - Maintenance
*November - UNDERCOAT REMOVAL
December - Maintenance
*Extremely Important grooming requirement (missing this step could cause additional damage to the skin or coat)

PLEASE DO NOT SHAVE or TRIM YOUR DOG'S COAT!
Shaving or trimming your double-coated dog causes irreversible damage to the hair follicles.  The coat may not ever fully recover from this damage.  "Shavedowns" or "summer-cuts" should only be considered as a last resort option for medical reasons, or if the undercoat is severely matted making removal impossible. (CLICK HERE for detailed information on this topic)