Sadie does that sometimes - she will eat grass and throw up - so I try to stop her from eating it and I think she hasn't done it in a while. I used to think she ate it and did not throw up but then I started seeing the heaving. After vomiting she grazes again. A lot of stuff she does doesn't make sense and she doesn't seem to understand why I stop her.

Pam - Sadie sounds a lot like Ripley - it became fairly regular for her and she turns her nose to treats all the time, definitely not motivated by food (I blame her poor training on that fact, how could I reward her?)