Why don't dogs play poker?

[jdl22]

I've seen several paintings of dogs playing poker, but every time I go to a cardroom or house game I never see dogs at the table.

Why don't dogs play poker? I don't want to hear any speciesist crap about how they don't have the mental capacity, good enough jobs to have money to play, opposable thumbs to hold the cards, or the discipline to not wag their tails and drool when they get aces.