People with animals like that have nothing to lose so why worry about liability?
There’s tons of things that trigger dogs. My 4 year old blue healer border collie cross jumped my 1 year old Kelpie border collie cross for getting to close to his food in his bowl that he wasn’t eating. They put on quite a show for a minute or so. The dogs get along great most times. The 1 year old is learning boundaries and pecking order. Not the first time, bet it ain’t the last, but they are together constantly. I don’t do dog parks.