Does your dog graze on grass?
All dogs do it at different times. I've always thought until recently that they do it when they have an upset stomach and then vomit afterwards.
According to my research on various pet web sites the texture of the grass tickles their throat and stomach lining causing them to vomit out anything that has upset them.
Yesterday while outside taking photos I noticed Marley and Jasper just happily grazing away at the long grass. No vomitting afterwards, no stomach ache, just happily munching like two little cows...
...and then resting in the sunshine afterwards.
According to http://www.dogs.about.com/ "dogs today seek out plants as an alternative food source. Most commonly the plant is grass since that is what is closest at hand but wild canines are known to eat fruits, berries, and other vegetable matter, too......dogs can find their nutrients in a wide range of plant foods,
grass contains essential nutrients that a dog might crave, especially if it's on a commercial diet. If you notice that your dog has been munching away on grass or houseplants, then you may want to introduce natural herbs or cooked vegetables into its diet."
"Maybe you should dish us up some more vegies Mummy!"