on purchases of $34.99 or more and
Free Standard Shipping on purchases of $34.99 or more applies in the U.S. only. Free Returns in the U.S. and Canada. Large, oversized items and products delivered by special or white glove carriers are not eligible for free shipping or free returns. Free returns are not applicable to final sale/non-returnable items. As always, check the deal's Fine Print for restrictions.
I have an 80 pound dog and ordered a large. It was much larger than I expected and I had to tighten it close to the entire way. Better too big than too small! It seems to be really good quality. I recommend this product.