Our furry best friends have frenemies too and here is a tank made just for them - 100% cotton for comfort and breathability (fiber content may vary for different colors). It is safe to machine wash and comes in multiple sizes, M - XL. For breeds with larger chests, sizing up is recommended. 
NOTE: Never leave clothes on your dogs unattended or for long periods. Garments can become tangled or stuck on your dog.
Another consideration- just because you are hot or cold doesn't mean your furry friend is. 
100% combed ringspun cotton (fiber content may vary for different colors)
Medium fabric 
For breeds with a larger chest, purchase one size up from the weight range. Dog tanks run small.