I don't actually know what that means--dog day afternoon--but I envision is as laying around in the sun, being lazy and possibly licking oneself. Never mind, scratch that last part. Anyway, here are some dog cards for you to check out.
The Fine Print: Top dog by Stamps by Judith, sympathy dog by Copper Leaf Creations. Remember if you run with the dogs, don't be surprised if you get fleas.