How to measure your dog.
First, measure your dog or cat from tip of nose to base of tail. Do not include any part of the tail in your measurement. This is measurement A.
Then, measure from the elbow joint in the forearm to the ground. This is measurement B.
Then measure across the widest part of your pet (usually th shoulders). This is measurement C.
Then, when your pet is standing erect, measure from the top of your pet's head to the ground. Add the measurement from the top of the head to the tip of your dog's or cat's ears if the ears are held erect. This is measurement D.