Oh my goodness, I just saw a white worm coming out of Harry's bum (sorry to be gross). He's never had worms, so I don't know what to do! Should I take him to an emergency vet today (sunday), or can it wait until tomorrow? Is there anything over-the-counter I can get for him? Are worms contagious? Will Maggie get his worms? I'm so worried for him, and so grossed out. Thanks in advance for help!