Don't see the point anymore!

I have a four-year-old German Shepherd bitch, recently while checking her teeth I noticed the tips of all four of her canine teeth are flat, like they have been chopped off. Her teeth are very clean and she has no problem eating. A friend was in the vets and asked the vet about this, he said it could be hereditary, I was wondering do you have any ideas on what this may be or if it may just be hereditary?
Thank you
Mr Charles Moy

Does she chew? Does she play with stones? It is possible to wear down teeth with excessive chewing. It's also quite possible to break them if you've got a dog that likes to play with stones.
Beverley Cuddy, Editor

Sheila Wills, Head of Internal Medicine at the Animal Health Trust, says...
Does your dog chew stones? Or is she kept in a wire cage at any time and chews on the bars? The most common cause of flattening of the incisors in dogs is stone chewing. I’d recommend a visit to your vets to get them checked out.