I find it an interesting item; I used it for my cockerel and it actually gives my pet some relief during walks in the hottest hours. It needs to be wetted just before going out as it does drip a bit. The size is not very precise for my cockerel, which has a really wide chest, but it's workable as the straps can be widened; perhaps if they were elastic they would fit better. Overall, I recommend it.
The cooling vest works. I ordered a second one because I got the wrong size the first time.
