I'd argue 60lbs is larger than 'medium' since most buildings have their weight limits lower. Everyone's dog is sweet, and would never do anything... until it does. The rule is if you're bringing a dog on the subway it must be in a bag, or container.

I'm not a baby because i consider the needs of others besides my own selfish ones. You sound like the person who keeps their dog off leash and when a kid runs away you laugh and say "but he loves people "