We utilized this life jacket once, about a year ago, on a boat sightseeing dolphin trip, and she has now outgrown it. And it has been collecting dust. Keep in mind that this is for a little dog. Please check the size chart and measure your dog before purchasing. I've included the product description from where we purchased it. The item does work. Please keep in mind that this item is for mini and small dogs under 12 pounds. 

Product Description

• SIZING BASED ON GIRTH: Dogs come in all shapes and sizes. Whether your dog is short and stout or long and lanky, there's a dog life jacket fit for them. Available in sizes XS–XL and featuring adjustable straps, we've made it easy for you to choose a size that supports them based on their girth measurement. We recommend sizing up if the dog's girth is on the higher end of this size.
• SPLASH WITH SAFETY: The Outward Hound Granby Splash life jacket for dogs is designed with bright colors and reflective accents to provide better visibility while swimming. A front neck float helps keep your dog's head above water, whether they are a novice or experienced swimmer.
• Novice & Experienced Swimmer-Friendly: The Granby Splash dog life jacket is constructed with ripstop material that provides maximum buoyancy in the water without restricting movement on land. Adjustable straps and side release buckles provide a secure fit, and the neoprene belly band supports their chest and belly while getting their float on.
• SINGLE RESCUE HANDLE DESIGN: A top grab handle makes it easy to restrain and lift your dog out of the water and provides easy access for a rescue should they get into trouble.
• PLAY IT SAFE: No pet accessory is indestructible. Do not leave with unsupervised pets. Remove and replace if damaged.