Contrary to what I thought when I first heard the word, "catnip" does not have anything to do with trying to take a small bite out of one of our feline foe. (Ha woo woo woo!) In fact, it's a plant that's a member of the mint family! According to Wikipedia, "Most of the species are herbaceous perennial plants, but some are annuals. They have sturdy stems with opposite heart-shaped, green to grayish-green leaves." Two out of three cats surveyed reported feeling a narcotic-like effect from it. Woo. The plants even contain a substance that is reported to be an effective mosquito repellent!
Zim and I couldn't find any information about the possibility of "dognip", but there were some snarky comments about "it's bound to be something stinky". That's not real helpful! Zim said he thought he had spotted some mint on our deck, growing near his beloved basil plants. (He's helping Mom grow Sweet Basil and a special Purple colored one this year!) We thought we'd check it out and see if it did anything for us!
Oh... yeah! Spearmint AND Chocolate Mint! Yum!
Echo, I hope that answers your question about "catnip"! And as per "dognip", technically there is no such plant, but Zim and I highly recommend Chocolate Mint. Or Sweet Basil! YUM! Wasn't it nice of our mom to put the crocks up on these stands so they'd be at snacking level?