are Greater Swiss Mountain Dogs mellow?

we have a Greater Swiss Mountain Dog puppy at the petstore i work at and she is just as mellow as can be! she looks like Dale(the swissy) and is so C-U-T-E!:D i remember hearing Dale's mummy saying he was a handful so i'm questioning if the breed is mellow or hyper.

My casey is REALLY mellow...I think she has swissie in her...

I think it just depends on the dog.

I've met some VERY extremely hyper labs, and i've met some very mellow ones. (Just as an example)

there was one at the dog park the other day which seemed to be rather mellow, but I don't actually know anything about the breed, that's just what I observed.

I think it pretty much depends on the individual dog. But GSM's usually & generally have an inbetween activity level.
Most puppies are usually hyper, regardless of the breed.
She may be mellower just cause from all the stress being at a pet store (being shipped, customers, small cage, no exercise, different foods etc...)