No-but each owner must use common sense. A dog releases heat primarily though panting and though the feet and ears. The Lycra Bodysuit will not keep a dog from cooling itself through these channels.
We have consulted with numerous veterinarians and have had a large teaching veterinary hospital conduct a heat stress study for us. We have found no overheating with this garment. 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.