Do you have fox tails in your yard?

Ok not totally a question more of a warning just a heads up. So I have fox tails in my backyard I'm not sure exactly what they're called but that's what we call them you know those weeds that are green then turn tan and are kind of pokey.

http://en.wikipedia.org/wiki/Foxtail_(diaspore)

Anyways my dog's foot has gotten really swollen last Friday so we said if it got worse we'd take her to the vet and by Sunday we noticed a little hole on her paw and it was swollen and red, we took her to the vet on Monday and on Tuesday she was scheduled for surgery : / She has 2 fox tails that embedded themselves into her skin it was a $500 vet bill but she's doing a lot better now. She has to wear a cast until next week and a plastic bag over it every time she goes outside. So just a warning if you have fox tails in your backyard