"Coat length" refers to the overall length of a garment, usually a coat or jacket, from the top of the shoulder to the hem at the bottom. It helps determine how long the coat is. Full definition
In terms of brushing your dog for general purposes, the answer is roughly about every couple of days regardless of coat length. (animalbehaviorcollege.com)
The frequency will depend on coat length and type, activity level, environment, and overall health. (veterinaryassociates.net)
The sheer variety in coat length and texture resulted in variation along the shepherd lines as they were developed. (caninejournal.com)