I never read that but I did do something similar back in the day when full size frame pumps were all that there was. A dog chased me while was climbing a steep grade with the owner in the yard gardening! the owner never tried to call the dog back. So here comes fido growling and trying to bite the back of my leg, I unsprung the pump and smacked his face as hard as I could, the dog went screaming back to it's daddy who then yelled at me that I hit his dog, to which I replied back that the next time his dog comes after me I'll kill it. Never saw the dog again, and there was quite a bit of blood and particles of skin debris on the pump, so I think I hurt it pretty good.
Jamming a pump down a dog's throat would be all but impossible to do, but the point is to smack it hard enough that it knows it's time to go home. I had a solid aluminum frame pump, today's mini pumps really aren't suited for that.