Star vs. the Forces of Evil - Season 2 Episode 6 -

Star throws her wand by accident and it ends up in the mouth of a growling dog who refuses to let it go. She has to take care of the dog and find its owner. Meanwhile, Marco struggles to get a straw into his juice box and has to take care of the laser puppies. She eventually discovers the dog named Willoughby is actually an extra-dimensional being who didn't like life on her planet, so Star has her adopted by a strange lady named Lydia.