Well, Bella does this and the vets says sometimes they grown out of it. There is something they can give them. Well lucky Bella does not do that anymore but I stay at home so I have to monitor her.
She still goes out to get some but I make this horrible sound and slap my hands and she darts away.
But she does not eat hers she eats everyone else's. We have 3-schnauzers and 1-other yorkie.
Hope that helps.
Cheryl/Jack/Bella