Any tips would be appreciated!

Lexy • Blessed with our rainbow baby June 2020 👶🏻🌈 Baby #2 making an appearance July 2021 😭😍

My hubby and I just recently got a rescue dog from a shelter!! He’s never been around cats, and my hubby and I have 3 cats! Every time he sees them he tries to chase them! Does anyone have any training tips on how to get him to stop doing that??