Dogs are so much more than just cuddly companions. They can be trained to perform all sorts of tricks that will amuse and entertain you and your guests. But not all dogs are equally enthusiastic about showing off their skills. Some dog breeds are more eager to please than others, and some just do not have the attention span for it.
One of the biggest problems we see are dogs that lose their mind when they see other dogs and people. This behavior is often labeled as aggression.