Pete the Vet: Why is my dog eating grass? Is it dangerous?

Pete the Vet answers your questions

"Why does my dog eat grass - and can it cause her any harm?"

For the last number of days my Chihuahua, Aggie, has been eating a lot of grass. She eats it for five minutes at a time, several times a day. Why does she do this and can it cause her any harm? 

-GM, Dublin