What Size do you need? Compare the chart below.
Maximum
Muff Typical Head Inner Shell
Size Weight Circumference Width Height
X-Small 5-10 lbs 7-9" 1.5" 1.625"
Small 9-25 lbs 9-13" 1.75" 1.75"
Medium 20-50 lbs 13-18" 2.5" 2.5"
Large 50-95 lbs 18-23" 3.25" 3.25"
X-Large 95+ lbs 23+ 4" 4"
One important measurement is the width of your dog's ear at the top of his head. Compare this to the maximum inside shell width.
The overall circumference measurement of your dog's noggin at the largest point is also a good determination of size, because if you choose a size too large, the muffs won't seal well against his head, and you lose all the sound-reducing properties you were shooting for.
Your dog's weight is also a good indicator of which size to choose.
