I Don't Think this Would Work Well for Decorative Purposes
Lol. Oh goodness!.............okay now that I’ve stopped laughing...No, wait not done laughing yet...................okay.
I live in DC and actually I can see some of the girls doing that here. Like the ones that wear extensions and actually, I can't lie, I've worn them before myself and actually might have put these on my dog too just for fun, but she hates any sort of clothes anyway. Come to think of it, I don't think the hair thing would last long because on a dog, it's not like a decoration, it's like hair. I forgot I did try it once but not for decoration like you're saying.
Like I remember, my ex and I used to have my little girl and a tan Italian greyhound and the greyhound had this really beautiful little face and delicate features. My ex bought the greyhound, so he got him when we split up.
Anyway, I was wearing weaves then and one of the funniest things to do was put some tracks of hair on him. He looked so ridiculously gorgeous. Like a model or something, but he was a dog. It was so, so funny. But it really doesn't look like decoration. If pageant decor is what you're going for, I'd definitely stick with bows, maybe a little durable sparkly dog jewelry, belts etc. Hair just looks like hair.