I would expect the pork to be part of a decomposing piglet, otherwise Grime was training him to alert to normal pork. He wouldn't do that because it would mess up all his previous training. This type of training allowed Eddie to alert to such things as;
The search of a suspect's 'totally burnt out vehicle' by forensic scientists did not reveal any evidence.
A 'one minute' search by the EVRD identified a position in the rear passenger footwell where the dog alerted to the presence of human material.
A sample was taken and when analysed revealed the victim's DNA.
The enquiry then concentrated it's efforts on the suspect and the EVRD located the body of the woman in a river bank deposition site.
http://www.mccannpjfiles.co.uk/PJ/MARTIN_GRIMES_PERSONAL.htm
Can you just clear something up in my mind Gunit.
Eddie was trained using decomposed piglets.
Eddie was trained using human bodies.
Eddie alerts to cadaver scent.
Eddie alerts to blood.
Eddie alerted to blood from a person who was alive, Gerry, he also alerted to Grime's blood that he hid for Eddie to find.
Grime said it was difficult for Eddie to discriminate between pork and human remains, they are so alike.
Eddie would not have forgotten his training with pigs.
So it is possible that Eddie WOULD alert to a pork chop etc. as Eddie alerted to blood from a person who was still alive, therefore it wouldn't matter if the pork was decomposed or not, Eddie wouldn't know the difference.
If there was pig blood or bone in the garden compost, Eddie would also alert to that.