This isn't really a grooming question but Ill be buying a GSD pretty soon and was just wondering when does a GSD's undercoat start growing in. I live in Indiana so during the winter it gets in the single digits(F), if anyone can give me any info on GSD puppy and living in a cold climate i would really appreciate it, and im not a fan of pet clothes at all but if my pup will benefit from it when i take him outside(short periods of time) ill buy one.

German shepherd has three different coat types:

Normal stock hair German Shepherds are the most common types. The individual hairs are straight, coarse and lay against the body. Their coat is short on the head, front of the legs, hind legs, and the feet and toes. It is longer and thicker on the neck, and back of the fore and hind legs.

Long stock hair German Shepherd individual hair is longer and does not lie close to the body. Their coat is considerably longer inside, behind the ears, and on the back of the forearm. The thighs are usually long and thick with a bushy tail with feathering underneath. Some kennel clubs disqualify this type of coat as undesirable.

The long haired German Shepherd coat is considerably longer than the long stock hair. It is usually soft and forms a parting along the back. Occasionally, there will be an undercoat along the loins or none at all.

While German Shepherds shed year round, shedding becomes really noticeable twice a year when they "blow their coat". This is where they basically shed most of the summer, (then later on winter) coat over the course of a week or so.

I really am not sure of the answer to your question.I would imagine they have it as a puppy.

I have my first LH,not sure if she is a true LH or LSH, but she is now 5 months old and still has no undercoat. I wish I could remember when my Stock coat got the undercoat, but I can't, I am thinking around 6 months, I'm sure someone on here knows.

thanks for the info