So can a scary dog costume actually make a dog look scary? I don’t think so (they’re too cute!), but you can try with these suggestions.
You will find many more costume ideas as Costume Craze.
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All in black, Zorro dog looks pretty intimidating!
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It doesn’t get much scarier than Darth Vader dog, does it!? 
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The Skeleton dog costume is pretty creepy, too.
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Enjoy scary stories? Here’s one from GhostStories.ws
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The Phantom Dog And Horse
A Personal Experience By Donald Ryles PhD, CH
Donald Ryles is a metaphysician, author, and clairvoyant with a new book called Hidden Secrets of “Many, But One” See his website at http://www.drryles.com.
… Many nights I would be on that swing until well into the night listening to my small transistor radio, as long as I kept it low. It was just me, the music, and a soft light from a distant streetlight.
One night about 10 PM I suddenly had the strange feeling that something was behind me looking at me… Read more at GhostStories.ws
Have a very scary Halloween! Sydney and Zoe
These certainly are very scary costumes for dogs…The Zorro doggie outfit is positively spooky! Or maybe I’ll go with a Darth Vader costume for Grommit the little white doggie this Halloween. Thanks again and take care.
That is so scary, please don’t come trick-or-treating at MY house! Chuckles and Sampson would have to smell you to make sure you are O.K.
Well, than Halloween is just the holiday for you! It’s true, there’s nothing cuter than a dachshund dressed up as a little red devil, so let’s look at some of the many Halloween dog costumes that are available for you and your little pooch to enjoy.