Leaving the Cat to Guard the Cream
Cats can’t be trusted around milk or cream, which is the source of the old expression “don’t let the cat guard the milk.” Some people are familiar with different versions of this expression, some versions say “don’t let the fox guard the hens” or something along those lines – but you get the jist.

The cat can’t be trusted to guard the milk, because chances are – he’ll end up drinking it! Can you blame him? You can’t expect someone to “guard” their favorite food and not take a bite. It looks like this is what happened here – the cat couldn’t help himself, and he shoved his furry head into this glass of milk. Oh well, there’s no use crying over spilled milk.