How do I dismiss a pet?

I just trained a pit bull to try it out before going for the big stuff. Trouble is now that I have a pet I can't tame another. Is there a way to dismiss your pet so you can tame another one?

I'm expecting it to be something obvious that I am just missing but maybe whatever you tame is yours for life.

pet ui, icon bottom right corner of the screen, option called Release

Thank you for that. It was something simple and something that I just overlooked/didn't see.

You can always kill the next one and eat it too. Only a game. :p