Dr Lonsdale graduated from the Royal Veterinary College, University of London in 1972. And thus began a varied career in veterinary medicine commencing as a volunteer in Nairobi, Kenya followed by work in farm animal, zoo animal and small animal private practice in the United Kingdom. In 1980 he emigrated to Australia and established a group of mixed animal veterinary clinics in Western Sydney.In the early years Dr Lonsdale adhered to conventional veterinary teaching and practice. However by the late 1980s his career took a different turn. Together with veterinary colleagues, dubbed the Raw Meaty Bones Lobby, a new perception, a new set of values took hold. It became clear to Dr Lonsdale that the modern fashion of feeding dogs and cats industrial, highly processed products was in fact the reason a majority of domestic carnivores suffer from putrid breath and a host of diet related diseases. By changing his patients' diet from packaged food to a diet of raw meaty bones puppies and kittens gained a new vitality. Old dogs and cats gained a new lease on life.Dr Lonsdale took up the challenge by blowing the whistle on the pet food industry/veterinary profession/fake animal welfare alliance. From 1991 to the present he has been the leader of the Raw Meaty Bones Lobby for better pet health, veterinary teaching and an end to the junk pet food fraud.