Safety Fridge

Doggy fridge-door stoppers?
I have a Doberman puppy who was born in August…He’s managed to open my relatively small fridge and get to a box of rich lintedore Chocolates. I got to him before he ate any, luckily. What could I get to keep my fridge door shut other than a padlock and chains?
It’s obviously pretty important that I do something to keep the fridge door shut…but I’ve never come across anything for your fridge that will keep it shut. Is there a safety lock that can be bought for it?
Any answers are greatly appreciated!
Put a chair in front of fridge.
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Food safety – When to clean out your fridge.flv