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All Ruffwear harnesses follow the same simple size guide found below. You'll just need to measure your dog's girth (widest part of rib cage) to choose the correct size and you can always reach out to us if you need any assistance.

Size Girth (widest part of rib cage)
XXSmall 13-17 IN (33-43 CM)
XSmall 17-22 IN (43-56 CM)
Small 22-27 IN (56-69 CM)
Medium 27-32 IN (69-81 CM)
Large/XLarge 32-42 IN (81-107 CM)

If your dog's measurements come out between two sizes...
For the Front Range Harness or Flagline Harness choose the larger size.
For the Web Master Harness or Load Up Harness choose the smaller size. 

Ruffwear Harness Size Chart: 

The above Ruffwear harness sizing can be followed for the following products:

Front Range Harness 
Flagline Harness
Web Master Harness
Load Up Harness 

Alternatively, size guides can be found below for other products from the Ruffwear range including Ruffwear dog beds.

Ruffwear Basecamp Dog Bed
Small (435g) - 24 X 18 IN (61 X 46 CM)
Medium (865g) - 36 X 23 IN (92 X 59 CM)
Large (1,320g) - 48 X 30 IN (122 X 77 CM)

Ruffwear Highlands Dog Pad
Medium (335g) - 16.8 IN W X 43.3 IN L (68 CM X 110 CM) 
Large (440g) - 26.8 IN W X 43.3 IN L (68 CM X 110 CM)