Pet dogs are not allowed Caltrain, however both San Francisco Muni and BART allow pet dogs to ride with a few restrictions.
- must be in a container (or bag?)
- cannot ride during rushhour (weekdays 5-9 am and 3-7 pm)
- must be muzzled and leashed
- require fair equal to the owner’s ($2)
I’ve never seen anyone pay fair for a dog or be turned away during rushhour, but it’s probably not worth the risk.
I’ve started feeling really annoyed by all the rules about where dogs can and cannot go. I feel like most rules were designed to control large aggressive dogs so the rules just seem silly when applied to Ada. A muzzle? Seriously?
-- Tessa

Hi I am feeling the same way you feel, but not all large breed dogs are aggressive, so why punish them all?
I understand where you are coming from on the muzzle issue (is there one that small).
Try putting a 100 pound dog in a kennel and lug it around on B.A.R.T difficult even if all elevators and escalators are functioning properly. Bottom line there should be fairness to all.