Resist the temptation to have them
too tame. Don't hand feed, don't put up with them pressing into you, tripping you up, etc, while they're young. They grow into big, stocky things that will be able to really hurt you just by being overfriendly!
I always say don't have two, have three. Then if something happens to one, you aren't madly searching for a companion for the one that's left