AKC Canine Good Citizen (CGC) evaluators are another class of dog-training professionals. AKC CGC Evaluators may or may not be trainers or behaviorists, but are certified by the AKC to evaluate dogs in the Canine Good Citizen test. Training other behaviors and getting a dog used to being alone, for example, can help reduce separation anxiety. The root cause, however, would likely need to be determined by a behaviorist, who could then refer you to a trainer if he or she was not able to help with the training issues.
Martingale collars (also called limited-slip collars) are usually made of flat nylon with a smaller fixed-length section (made of either nylon or a short length of chain) that, when pulled on by the leash, shortens up tightening the collar around the dog's neck, to a limited extent. When properly fitted, martingales are looser than flat-buckle collars when not tightened, and less severely corrective than slip collars when tightened.
Unless you plan to keep your dog outdoors--and few of us do because it's not recommended--you'll need to teach your dog where to eliminate. Therefore, house training (also called housebreaking or potty training) is one of the first things you need to work on with your dog. Crate training can be a very helpful part of the training process. This includes house training as well as many other areas of training: