Over the weekend Stephen heard from the boss of a prominent animal rights group who said we should stop calling our pets - 'pets'.   Ingrid Newkirk who runs  PETA (People for the Ethical Treatment of Animals) says the term 'pet' is derogatory because it makes living things sound like a 'commodity' or 'decoration'... They aren't, she says.  "something which allows you to go out for a walk'.  They say it's all to do with something called speciesism.  I spoke to freelance journalist and broadcaster Angela Epstein and Dr Corey Wrenn a lecturer in sociology at the University of Kent.