1The key to fit in this pouch is pet back length and chest girth, back length doesn't include tail and neck, please make sure to measure your pup and size up according to our sizing chart, size measurements should allow room for 2 fingers to fit between item and pet. 2Shoulder strap can be easily adjusted according to small or large sized person height, adjustable chest strap goes around the persons back to hold the dog secure, what's more, it's also a great photo prop to take funny pictures for daily sharing. 3Intimate detail design, legs out and tail out design, elastic opening, both sides zipper, breathable mesh fabric, padded pouch back with sponge, interal loop hook to pup harness. 4This dog front pack carrier is lightweight, you can fold it up small enough to fit in a tote bag, great to carry small dogs or cats for biking, hiking, camping, out walking or meeting friends, it allows owners and their lovely pets to have more adventures together. 5Give pets a break from sitting in this pack once an hour, at least take off the pack and hold them horizontally for awhile to regulate their spinal alignment and circulation to their feet.