So, it's not exactly the Halloween time of year, but it will be soon.
My pup Nikita has always been a little crazy and hard to handle, so I call her "Devil Dog." Of course, that meant I had to make her a devil costume for Halloween.
It started out as a supercheap doggie shirt like this (it could be plain, color coordinated, whatever):
and I added devil horns and tail similar to these
If you keep your eyes out, you can find child-sized horns/tails for $1 at Target, Kmart, etc.
Then remove the plastic headband from the horns (just snip a hole in one end and pull the headband out). This can be tied or velcro-ed under your pup's chin.
Then I stitched the tail to the base of the doggie t-shirt.
Now I have a real little Devil Dog
Oh yeah, since it's a toddler/child costume, everything is pretty much doggie safe. The dyes are non-toxic, no small parts, etc. Nikita is willing to wear it for a whole evening and even falls asleep in her t-shirt.