In 2009, an estimated 62.1 million metric tons of eggs were produced worldwide from a total laying flock of approximately 6.4 billion hens. There are issues of regional variation in demand and expectation, as well as current debates concerning methods of mass production.
Olives are not toxic to cats, but have little nutritional value. Green olives and pimentos contain chemicals similar to those found in catnip, so some cats may be especially excited by olives.
Of course, if your dog is consuming walnuts in the form of a treat, think about what else is in there, such as chocolate, says Hughes. Black Walnuts, native to Northeastern U.S. and Canada, are toxic to horses and dogs, but non-toxic to cats.