Irrespective of size, breed and type of problem, each dog is an individual. It is important, therefore, before starting your first active training session, that you establish the most appropriate correction level for your dog. While it may seem logical to assume that a small dog will need less corrective stimulation (or strong vibration correction level on PAC Buzz collar) than the bigger dog, this is not always the case. There are many examples of large dogs, such as Great Danes, that are highly sensitive and of some smaller dogs, such as Beagles that require a much higher level of correction. Furthermore, among dogs of the same breed, and even among dogs from the same litter, there can be wide variation of reaction to a particular correction level. In addition, the Insulating effect of the fur on longhaired breeds will often require a higher setting … or the use of different probes (see the PACDOG instructions for use)