Getting the dog high? Why wasn't the whole thing deleted? Letting any comments ride on that one is a slippery slope, I should think. Especially ones condoning it or speaking of giving a dog something toxic.
Asking two questions?
What are the limits of personal abuse that will be tolerated on Metafilter?
When does a self link inside the comments of a post every now and then border on sheer un-adulterated pimping of your personal site? More than half of this guy's comments are links to his own site.