Look on
Etsy :: Your place to buy and sell all things handmade they have lots of different kinds of tags, some stores have really cute ones, plus because everything is handmade you can ask for something different if you dont see what you like... this store is an example
Urban Puppy on Etsy by UrbanPuppy on Etsy
Otherwise I got my tags from boomerangtags... they allow you to put a lot of lines and both sides, so you can add whatever information you want... plus they are guaranteed for life.