When I was a very small child, my grandmother had 2 White German Shepards and a Bernese Mountain Dog.
That Bernese Mountain dog was my best friend when I was a toddler. He died of natural causes when I was about 8 years old. But for the first 8 years of my life, going to Grandmas meant going to see "my dog". I used to actually sit on his back and he'd carry me around like he was a pony. I have pictures of me climbing all over him. He was very calm. He was great with all the kids. Best dog my grandmother ever had.
They are expensive, but I think they are worth it.