Wire dog muzzles are usually needed for dogs that have a tendency to bite or chew. However, there are many different circumstances in which a muzzle might be recommended or even required even if your dog isnt in that category, such as taking a dog out for a walk to a new un-familiar location or while on public transit systems.
1.Length - Distance from the tip of the nose to eye line in inches
2.Circumference - Circumference around snout one inch below eye line in inches
3.Eye Line - Distance from eye line to right behind the ears in inches
4.Neck Circumference- Circumference around neck behind ears in inches
5.Width- Snout width in the widest part
6.Height - Snout height , should be measured with mouth a little open
How to measure your Dog Click here