Here's a few links for Dog costumes.
We let ours help give out treats on the big day.
I don't think he understands why we dress him up,
or why so many people are out on the streets
http://www.costumecraze.com/dog-costumes.html
http://www.spoiledrottendoggies.com/ldcostume.htm
http://www.spoiledrottendoggies.com/mcostumes.htm