It must be said that, when looking into Greater Swiss Mountain Dog 101, you'll find that these dogs are of average intelligence. They work hard and appear very happy to do so, and they will often want to please you. Pulling carts is perhaps their best-known task, and yet dog carts are long gone. They can herd and do other tasks too, however. They are a bit overly aware of their strength but not so much how to restrain themselves, and you will need patience to train them during their slow march to maturity.
These dogs tend to be more bark than bite, literally. They will put up a show to dissuade a predator, and due to the breed's size, this is often successful. They are gentle but the can be clumsy in their later adolescent stages when they are adult-sized but not of adult mind. The best information you can know about Swissys is that a calm method of training will work much better than harsh means.
They doesn't need a lot of exercise, but they do need occasional spurts of strenuous activity. How long should such spurts be? When your Swissy wants to take a nap, they've had enough for he time being. There is a good bit of breed information available on these dogs to learn why they are given to their type of activity.