I think the Sound Anchor stands would solve the weight problem and keeping the stand from moving.
My main concern is keeping the speaker on the stand which a weighted stand gives no guarantee my $6500 speaker doesn't take a fall onto the corner of my amp or preamp.
No matter how well a dog is trained I could never fully trust it not to act on instinct and forget its training at some point. This is also why i have always used a training collar on my dog when she's outside of a fenced yard.