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.
Onions are toxic to dogs and cats: they cause anaemia. If you dog has received a toxic dose (not sure what this is, but probably as little as a whole onion) the signs of anaemia are weakness and pale gums. If your dog has eaten onion please take him to a vet. Chalice.