Question

In science we have learned that dogs are carnivores but I have seen many dogs eating grass why?
how can it happen

Answer 1

firstly, dogs are not carnivores they are omnivores .

yes dogs eat grass but their digestive track do not support "cellulose" . when they eat grass they vomit it out. if they eat grass then that means that they are treating themselves from digestive problems like worm, etc. the  grass acts as the roughage and clean their stomach