I had and have a rough collie.

Great dogs, really smart. My old one you could leave a plate of food on the floor and she wouldn't touch it, no matter what. You could also leave the front door wide open, wouldn't go out.

My current one, is a lad and is a lot more hyperactive. Doesn't bite unless your playing and always pees outside, dead smart and was quick to learn stuff.

Other favourites are shit zoos and saint bernards also look really cool. Golden retrievers too!