Way to notify of Ebay listings under certain terms?

[ZombieDawgs]

Is there anything that emails you if a new item goes up on Ebay? Say if I was looking for dog toys (I'm not) it would notify me every time a dog toy was put up? The thing I'm looking for is something I really want to keep a track of so I'm just hoping there's something to help me to do that which isn't refreshing every day.