As far as the type of dog harnesses that you can get, they really come in almost every shape and size. Some of them are rather simple and are nothing more than a couple of straps, one that goes underneath their chin in the chest area and the other which wraps behind their front legs. These dog harnesses are usually adjustable and are relatively inexpensive. The good part about them is that they are very effective in controlling your dog and make a great alternative to a single strap dog collar that is worn around the neck. Dog harnesses also come with special padding for on the chest area which can help you to control a dog that is especially aggressive at times, such as a police dog.