Got this for my 10lb Maltese and it was just too big. I wanted it to fit because it’s so cute! Overall though the quality is great. However the smallest size was too big so if you have a very small dog I don’t recommend.Sturdy and comfortable, didn't move around or fall off when my dog was running around and playing in the water at the beach. The fin on top is sturdy and stays upright. Super cute design as well, and there is a grip on the top so you can help carry and guide your dog in the water.fits my dog perfectly! he is heavy - full of muscles but this worked amazing on him and the buckles around neck and belly was very secure!I have a 4 lb dog and she is able to swim and be comfortable with this vest on. It’s easy to put on and the handle on top helps with picking my dog up. Super cute too!Fits a corgi and works well for him, helps him keep his head above water as he swims.My pup looks adorable in her mermaid life jacket and it was super sturdy! She was comfy and was able to safely swim and run around the pool in it! Highly recommend!!My girls aren’t the best swimmers so these have been a huge relief! My smaller dog only has 3 legs and is able to keep herself upright in this! Small dog wears a M and large dog wears an XLPerfect for my big girl Bernadoodle