Whats wrong with my dog?

Sometimes my dog will act like shes going to throw up, then swallows it and just keeps doing it, then starts going around the edges of everything in the current room, just eating whatever is there which is mostly occasional hair from my parents cats. When we let her outside so she can vomit/eat grass she eats till... show more Sometimes my dog will act like shes going to throw up, then swallows it and just keeps doing it, then starts going around the edges of everything in the current room, just eating whatever is there which is mostly occasional hair from my parents cats. When we let her outside so she can vomit/eat grass she eats till she pukes then tries to eat the vomit, and my parents think sometimes she keeps doing it because it gives her attention and shes known for playing the victim, but my brother thinks its because when she was a puppy she got into road salt (we took her to the vet for that when it happened, they pumped her stomach etc.)
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