This is what we commonly call cheat grass or cheat weed.  It grows in poor soil and under very dry conditions. Right now it's a shiny brownish purple color and it's  seeds are mature.

It's very easy for those seeds to get in your pets ears and toes if they go outside and you have Cheat Grass growing around your home.The darn stuff has a very sharp point on one end of the seed and it can cause ear infections. It's sharp enough to get between a dog's toes and cause infections in their feet.

We always check our two dogs ears and feet after they've spent time outside running around. Might want to do the same with yours. It could save you a vet bill for treating an infection.