I take no pleasure in an animals death, or in telling someone "I told you so", but when the emotional choice is one of senselessly bereaving for an animal that died due to the stupidity of its owner, or feeling disgust towards the owner who allowed their animal to die, I choose disgust.
For me, that disgust is manifest in the knowledge that I tried to warn the F* A*hole, but they ignored me.
Hope that helps.
Just can't imagine being so petty and vindictive as to get satisfaction out of something like that. Someone's dog gets killed and you would take pleasure in the "I told you so?" My Uncle John is like that and he has "I told you so'd" himself into black sheepdom.
"The unhappy derive comfort from the misfortunes of others." -Aesop