You will want to measure your dog for a collar by using a household tape measure. Start at the back of his neck then run the tape measure around the dog's neck to beginning of the tape. From there, simply add 2" to 3" to the total length--this gives your dog enough room for size adjustment. If your dog has an 22" neck, and you order an 24" collar, then more than likely this collar will fit. A 22" collar should be used for a dog with a 20" neck, giving extra comfort that doesn't choke.
This will give your pet some extra room should he gain weight or grow more than you anticipate. Collars should fit snugly, but allow you to put a couple of fingers between the collar and your dog's neck without any difficulty. Collars should never be loose enough to slide up beyond your dog's ears.  

When buying collars for puppies, be very careful! Pups can grow very quickly, and if you don't pay attention on a regular basis, you may inadvertently start choking the little pup. The best collars are those that provide plenty of size adjustment so your dog can grow into it.

For owners with dogs that run loose outside and where escape is a real possibility, the collar you put on him may mean the difference between you getting him back or losing him forever. Choose a collar that has your dog's identification (including his name, your full name, address, and phone number) securely fastened to the collar. Dogs that get loose and have collars with dangling tags cant get caught on weeds or debris and torn off. OfficialdogHouse.com sells dog collars that you can have your dog's name and your phone number woven into the collar.

If you're looking for anti-bark collars to train your dog to stop barking at all hours, there are several options. You can get a shock collar, one that emits an increasingly higher and louder tone to startle the dog, or collars that spray citronella to distract your pet every time he barks. Some feel shock collars are not humane.

Why not ad a little style to your dog's life with a designer dog collar for your pet. There are many to choose from, including gemstone-studded, spiked, and even Personalized or Harley-Davidson Collars. They're a great way to give your dog some style and help with doggie self esteem issues.

Dog harness sizing is measured by the dog's girth measurement. The Girth is measured aroung the widest part of the dog, just behind the front paws. Start with a tape measure at the top of your dog at the base of her neck. Measure down under the dogs belly and back up to where you started. This is the girth.