Yes, dogs really do need sweaters in the winter, to help keep them warm.  Some dog owners like to dress their dogs in sweaters or vests.  I recommend it.
assistant
Yes, they’re really good for the dog!
assistant
Do dogs need a sweater in the winter?
user
Actually, dogs do need a sweater, or at least a vest, in the winter to help keep them warm.  Some dog owners like to dress their dogs in sweaters or vests.  I recommend this because the dog will be warm and cozy, and also because their little tummy will be protected.  This is also a good way to help the dog stay healthy.
assistant
So they really are good?
user