[doganjo]

Never had this problem, my dogs are not near the front door when I am out; but certainly endorse ensuring the pup is caged when you are not there - after having been exercised, and having water left for her/him of course.

[Marches Farmer]

How about aversion therapy?  Soak a fake letter or two in something disgusting, like vinegar, pop it through and ....

[Garvie]

Neither have I we have always had my dogs in a kennel from day one but because the OH hasn't got his finger put we don't have a kennel but I have been promised one when he gets his week holiday in October( I will believe it when I see it haha) and we have tried using vinegar befor and the wee weirdo likes it

[Fanackapan]

Personally, I think most dogs see the door being rattled and then something coming through the letter box as more of a threat than a game , maybe they are in guarding/protective mode . Certainly the 1 dog we owned that shredded mail was of this inclination , he was so determined that even the wire cage didn't stop him so it was lined with plywood but he used to still bite and attack it frantically when the post came through but ignored the box at any other time. Eventually we moved home and the new place had an inner door in the hallway so the problem was solved ......bit drastic though eh ?

[SallyintNorth]

Personally, I think most dogs see the door being rattled and then something coming through the letter box as more of a threat than a game , maybe they are in guarding/protective mode .

I was about to post the same.  So making the letter unpalatable won't have much effect, the dog is just trying to protect you.

Get a letter-box cage. In general I am all in favour of 'engineering out' problems.

  - and if you can do it soon, before it becomes a real ingrained habit, so much the better 

[Garvie]

problem is now solved, letter flap gorilla taped closed and new external post box no more letter shredding

[jaykay]

Smart