Certainly, you don't want you dog to be in danger. When the temps dropped to single digits and the wind chill pushed it to below zero, I brought my dogs inside. Hoss, the bulldog, has thinner skin and a short coat, but his age is a more critical factor. He's more than 13 years old (ancient for a bulldog) and has some bad arthritis (he takes Rimadyl and Tramadol daily). Kona would be fine - he has a doghouse with blankets to nest in, isn't too old yet, and has the weather-resistant double coat. Bringing him in for a couple of days however, I felt was a prudent move - and when dealing with you dogs, it often comes down to common sense.