First, people tend to get dogs without really fitting the breed or cross to the needs of the person. For example, if the person wants a top notch Agility or Obedience dog, a Basset Hound is not the best choice. Bassets are a great choice for the person who wants to get into tracking but just are not the best for top Obedience competitions. Similarly, someone who wants to do Lure Coursing would be disappointed in a Collie . A person who wants a good first dog that is easy to manage would be insane to get a dog that requires an experienced owner Border Collies and Jack Russells are not the best choice for a first time dog owner.
Some breeds are more laid back and others are very active.
The wrong match can be a disaster waiting to happen. This holds true whether or not you are looking for a potential competition dog or just a pet. Second, most failures in a dog s training which can lead to the opinion the breed is dumb often are not with the breed or cross but with the creature at the other end of the lead. Failure to properly socialize and delaying training until the puppy is grown are two common mistakes. Not being consistent with what is expected, having reasonable expectations based on age and ability and confusion when other people involved fail to have consistency can be very detrimental to the speed and extent of learning.