No-but each owner must use common sense. A dog releases heat primarily though panting and though the feet and ears. The Waterproof Bodysuit will not keep a dog from cooling itself through these channels.
We have tested this garment in 80 degree temperatures without problems, but this garment is warmer and just prudence needs to be uses. Heatstroke can be a concern anytime temperatures rise-with or without a K9 Top Coat. SO always remember to have plenty of fresh water and shade available.