I used to work in the petfood industry...and no, never ever would I eat it.
Our products went to Pedigree (who are or were part of the Mars group) Ingredients include...
Beef lung, straight from the abatoirs. I'm not sure it's even legal to sell lung now for human consumption after BSE became a big thing.
Blood, probably 100 gallon vats of concealed blood...again from the abatoirs.
Probably not for dog food but lorry loads of fish waste, heads, anything left after collecting etc.
Lots of 'meat for pet food is actually extruded 'paste made from all sorts of by products, ground through massive machines then formed into useable pellets. Transport, storage, handling, manufacturing...none of it meets requirements for human consumption and if you saw the processes involved....no way would you eat it.