Life is too short: eat dessert instead
I had a cat that got its head caught in a jar like that once, luckily I was there to get it out.
oh, i watch him. He'd also have to eat about three pounds of kibble to get far enough down for it to be a danger. Usually I just put the big bag on the floor and let him graze, but that day he actually got up on the counter and yanked the cover off the jar--one of those "gotta have it NOW" moments. Now the jar's in a cupboard.