In the (modified) words of Homer Simpson: Spider-dog does what ever a spider-dog does. Can he swing from a web? No, he can't because he's a dog. Look out! He's a spider-dog.
And, seriously, watch out. Canines can now don spider costumes and vexingly clever owners, like super-prankster SA Wardęga, are, ahem, unleashing these hybrids on the unassuming public. Just watch as this lil' pooch plops around an elevator and terrifies two women! See him make a grown man lose his you-know-what! Much scare. Very scream. Wow spider. Doge.