@g8erjackie Hi Jackie! I am guessing here, but to me it sounds like Ruckus has "come of age" " and isn't gonna' take no ****". He now has a little sister to protect, and
they are also braver when there is more than one(even though Regina is a baby) Since Ruckus really loves Regina, I believe he is going to be protective of her.The "cowardly lion" has found his courage,and it's called Regina! As for" leash reactivity",A lot of dogs are more reactive/protective, when they are leashed, and some are just jerks(which their owner wouldn't admit!!!) You may have to be more careful when approaching dogs from now on. Ruckus is the "big bro"!