I just bought Ozzy a life vest yesterday at Petco. It was around $20. I got the tiny size and he is 3.5 lbs. umm the brand is Fido Float but I don't see it on the website. It fits him great. I need to get some doggles for him for motorcycle season. yeah!!
oops here is the vest for $14!!
Fido Float Life Vest Tiny - Dog Life Vests at Arcata Pet Supplies