Hi, I have a golden retriever and it's a female of 3 months old..but she is very fast and furious in eating the food and she don't have patience to wait for the food to be kept to eat...and she eats all not eatables like sand, papers etc...if we eat any snacks or food even she asks that at time of 2 or 3 in the mid-morning also she barks for anything to be eaten. what can be done in this case to make her not to come for food so aggressively.....