
The only size listed for sizing was bust. Our dog has a 23 inch chest which fits to the top of the small bag. While the chest area of the saddlebag fits perfectly, the strap, which should be close to the hips in the back, is not tight. I will most likely be modifying it myself to either lengthen or remove this strap so I'm hoping this won't be a problem but wanted to warn others. Your dog is a medium size, choose the larger of the two sizes. We haven't had a chance to use it regularly so can't comment on durability, but the quality looks okay out of the box. If we run into any issues I will definitely update my review.

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