My mate breeds them. They are indeed lovely looking dog but oh man are they hard work.
They are bloody wild, he has control over them but it’s a very fine line. They’re always looking for a sign of weakness and ready to have a go at becoming the top dog (pardon the pun). He had 2 of them out once and they started fighting – powerful as hell, he ended up rolling around, punching, kicking and all sorts to bring them under control.
Not for the faint herted, it’s a full time effort keeping them.
Having said that he loves them, uses them for sleigh pulling (has one on wheels) and racing. They have heaps of energy.
Not a good choice for a pet though.