Title says all.
I've heard from people that sparkledogs tend to be characters with more than 4 drastically different colors, but sometimes I see people being accused of being sparkledogs from having up to 2~3 drastically different colors. I've also heard about being considered sparkle if you have a large number of unnatural growths and accessories, such as talons, horns, bows, poofy mohawks and rainbow-colored junk.
So, what do YOU guys think a sparkledog is?
Personally, I go for the 4+ Color rule. I think also having more than 3 unnatural growths or accessories is too much.