Is it permitted to carry animals on a bus?

1. Yes, but only on a seat.
2. Yes, unrestrictedly.
3. Correct answer: Yes, when their size enables them to be carried on the passenger’s knees or held in his hands.
4. No, except for blind people’s guide-dogs.

WhyAn animal may ride on a bus if it is small enough to sit on the passenger's lap or be held in their hands.