So sorry to hear your black koi died. Wondering, was the black one the white one with black scales (in the pic above) or the black one with the orange head? My babies resemble your orange headed koi and I have a white matsuba that I thought was going to stay white, but is almost totally black now! My fault, should have realized the "matsuba" part of the name would mean it would get darker. Can't hardly see it in the pond, whereas Shamu, with his bright white belly, shows up very well.
Glad to hear your nursed a goldfish back to health! WOW about the cougar/mountain lion! I would be scared for sure! No letting dogs outside without human protection. Good thing they didn't take off to run after it. And, skunks are a mess when they let off their "perfume" defenses. Yuck!