所以能看做如是狗主人的福利，讓他狗免費坐公車。沒主人（未婚）的狗就無資格。
So it is like a benefit for dog owners. Letting their dogs ride the bus for free. (Unmarried) dogs without owners are not qualified.
但又不必然不是歧視行為。
“Not necessarily discriminatory.” – Yeah, not necessarily not necessarily discriminatory.