Why?
The pips contain a small amount of cyanide. No harm in small quantities but if could be harmfull if the dog is fed a lot of apples............
My oldest lurcher bitch eats blackberrys (when they're ripe) from the bushes and all my dogs get a garlic capsule regularly as well as loads of other stuff, brewers yeast, cod liver oil, cabbage, carrots, brown bread, goats milk, omega 3, white meat or lambs breast plus some dry or biscuits. Enough exercise or work daily and they rarely go to the vets other than for jabs or injuries.
My two oldest are 9 and 8 and are bouncing! Che