There’s a hypothesis that dogs sometimes eat grass because they’re hardwired to do it. We know that wolves and foxes, the wild canids of our times, not only feed on herbivores but eat their entire carcass. Because they eat the prey whole, foxes and wolves involuntarily also eat the plants that are in those animals’ stomachs. The dog’s ancestors probably did the same. So, it may not be a matter of needing the grass as much as it is about instincts.
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