SWwrote a review of Ruffwear Swamp Cooler Dog Vest on May 14, 2016
Familiarity: I've used it once or twice and have initial impressions
Our Mini Schnauzer overheats really easily, usually having to seek shade within 10 minutes out on the trails. The swamp cooler has keeps her cool. Since we have been using it, she has yet to have to seek out a shady place to chill on hikes. Just add water every 30 minutes or so.