I have notices with my guy it very much depends how the small dog acts around him. If the little one is confident and relaxed Watson treats them like any other dog and will play. If they are snarky and unsure he can become a little intense and I will step in and redirect him.
He is always carefully supervised when we go to the dog park…the main place where he encounters other dogs... He enjoys playing with other dogs and is pretty social.
I am careful not to allow him to meet other dogs while he is on leash since he is a bit leash reactive.