Catherine O'Driscoll is a founder of Canine Health Concern, and the author of 'What Vets Don't Tell You About Vaccines'.

A decade ago, Catherine was an 'ordinary' dog lover. She shared her life with her husband John Watt and four beautiful Golden Retrievers. And then Oliver - only four years old - died. Why? Pretty soon her other dogs were also sick, with thyroid disease, arthritis, and leukaemia. Prudence, Oliver's litter mate, died of leukaemia at the age of six. Why?

In their quest for answers, John and Catherine formed Canine Health Concern (CHC), an international group of veterinarians and animal guardians who research the causes of good and bad health in today's dogs. From this came the first (and only) definitive piece of research into the adverse effects of vaccines in dogs. CHC also began to promote natural feeding during the early '90s, and campaigned to make animal guardians aware of natural healthcare alternatives.

'What Vets Don't Tell You About Vaccines' became a word-of-mouth bestseller and was the subject of a network TV documentary which screened in the UK and around the world.

By profession, Catherine is a freelance PR and marketing consultant, and journalist. She and John now share their lives with Sophie, aged 16, Guinnevere, aged seven, and Edward and Daniel, two four-year-old non-vaccinated Golden Retrievers.