I wasn't aware that animals were allowed on the bus. And last time I was on a greyound bus I can't picture of where a kennel would fit under a seat.
It was my understanding that dogs had to ride under the bus, where the luggage goes. Of course I could be wrong, it's been known to happen a time or two
As for saving money, it shouldn't be that much it was something like $75 round trip from here to Edmonton which is like 3 hours so.....