The following message has been sent in by a reader - it is copied and pasted as written as a timing saving measure:-

Editorial theory on dog bite increase.   It would appear that the number of dogs biting people, including their owners, is increasing.   It makes one wonder if there is a common connection - dog food.    Are additives and preserves in some products making some dogs hyper-active?   Dog food is big business - but how controlled is it?   Maybe thought should be given to the subject?   The powers that be should certainly monitor the number of dog bites that are taking place and record the serious upward trend.