How can you tell a tamed cat’s health?

I was minding my own business and a creeper came behind me and blew up, cats should scare them away but the cat got hurt a little bit. I heard it so I fed it a few fish, should I use a potion of regeneration? Or fish?

Fish, I’m not sure how to see health but keep giving fish until they get hearts to breed. That means they are full health.