Ant, in proportion to body size.
You will need to be a little more specific. There are more than 10,000 species of ants on earth, and many of them are red. And what is more, many of them are called bull ants, and what does "stronger" mean for an ant? Stronger jaws? stronger legs?
horse and deer
to me a ant eater but to my friend a horse
While it is true that ants can lift objects many times their own size (such as a leaf), this is more the result of their small size than of being "stronger" than humans. If you've ever squished an ant, you'll know what I mean; if the ant was stronger than you, it would stop your finger. However, you're likely looking for the answer to whether an ant could beat a similarly-sized human in a contest of strength. Once again, the answer is no: scale the ant's size up, and it crumbles under the weight of its own body. Scale the human down, and you will find that they are also able to lift things many times their size (even moreso than the ant).
no.
no
Overall Ants are "stronger" as in being able to defeat termites in battle. But of course it depends on the species.
An ant can lift and carry objects that weigh several times their own weight. A wild cat cannot do that.
Get a stronger horse or lose weight
Yes.
Yes.
Yes their hooves are much stronger then glass.