Neonatal puppy viability: modified APGAR score

I imagine most people will agree that perinatal and neonatal medicine in companion animal practice lacks a certain degree of sophistication and expertise when compared to human medicine. The reasons for this are of course numerous and not for elaboration here. I did recently come across someone referring to the modified APGAR score when describing a case of dystocia in a bitch and I must admit I had not heard of it being used before.