Two of them got urethra blockages. 
https://www.hillspet.com/cat-care/healthcare/male-cat-urinary-blockage

One of them needed a procedure called a urethrostomy, which is sort of a sex change procedure 😀

oraltosun

I have had very bad luck feeding my male cats dry kibble over the years. 

siggy47

Dogs_And_Cats

I think homemade food is the healthiest. But in practice, not everyone has the opportunity to prepare homemade food. I give dry food to my cats. If I see they're uncomfortable with dry food then I give them both wet and dry food. 