Rachel Bowers, the owner ofBrooklyn Bark Dog Walking and Pet Sitting, recommends this one for when it’s sizzling but not blistering . On those days, after soaking the vest in water and ringing it out, she throws it into the fridge or freezer to get it even colder. Vests like this are best for short-haired canines, she says. Whether you utilize a harness or a collar for your dog is dependent upon your dog’s well being, and finally, your vet’s advice.