Thanks, Brooke. I've been trying to find out measurements, because I checked a few different brands, and they are each different.
Someone suggested the ones at Target. I checked them out today, and they are really big. They are size small, and claim to be for dogs up to 10#s. They are 2" long, by 1 & 1/2" wide, so a 4# dog would have to have some pretty big feet.
Besides, the sole is some kind of foam, and I don't believe it would wear well on concrete.
It's just my thought, but, I think, the better they fit, the more comfortable they would be for the dog to wear.
Just to see my 4#er's reaction, I put them on her, and she was willing to walk in them, but oh, my, she had to really raise those little paws high in order to do so.
Sheila