♠

♠ used in cards indicates the spades suit. It is black and kind of looks like an upside-down heart with a stem coming out the concave section. Spades is usually the strongest suit. In HTML, the proper way to show this is ♠ .

see also:   ♣   ♥   ♦

I ♥ my dog. I had her ♠.

I'm always tempted to read "I ♥ whatever" slogans as "I heart whatever" rather than the (presumably) intended "I love whatever." Since in this example ♠ is clearly meant to be read as "spayed," I'm inclined to read it as "I heart my dog. I had her spayed."

Besides, if you read ♥ as "love" rather than "heart," then the snappier version of this bumper sticker, "I ♠ my dog," could be read as "I dig my dog," which just isn't funny.

Edit: I've since been informed that "I dig my dog," is, in fact, funny. I stand (and laugh) corrected.