I think it depends on the dog.. Most dogs will be able to handle it. Our last dog went outside all the time.. but kodie doesnt. Hes trained inside. He's just too delicate. The vet also told me to keep him inside. If I did have a Maltese that wasnt delicate like Kodie... I would probably buy booties (kodie has those for walks too) and just put a sweater or coat on my baby when i take them outside.