Would you like to answer one of these unanswered questions instead?
Objective To examine whether high milk consumption is associated with mortality and fractures in women and men. The women responded to a second food frequency questionnaire in 1997.
I also remember a photo of depression era USA where a farmer is giving milk to pigs.
The caption said that the price was so low that they used it for animal feeding instead of selling for human comsumption. At some times and places, butter was the primary reason for dairies.
One could argue that cats might but it isn't good for them to do.
Here is a bit of a tangential example, because it isn't milk from cows.
At some point, blue tits and robins learnt that by pecking through the aluminum they can get access to the milk.
See this (non peer-reviewed) article that tells the story.
When I had dairy goats, excess milk was fed to adult dogs, adult cats, and many adult birds (e.g.
chickens, guinea hens, peacocks, etc.) The chickens acted like it they were children and the milk was free candy!