Happy Halloween! We challenged you to share Instagram snaps of your pets in costume — and we couldn't pick one favorite! Sure, not all animals are super excited about getting dressed up, but the result is so cute. From goulish ghost dogs to pets dressed like royalty, check out all the spooktacular Halloween pet pictures that were shared with POPSUGAR Pets. And we'll keep updating this post throughout All Hallows' Eve! Just tag your Instagram pictures with #POPSUGARPets, and your cute pet will be added to the collection.