You can beat this. It takes commitment and a whole lot of caution. But every day you clean, the risk drops.
In the meantime, take your dog for walks around the block (on clean pavement, avoid grass). Your yard will recover. Your dog will recover. And you’ll have an excellent story about that time you turned your backyard into a bio-security zone.
You’ve got this. Just keep bleaching, keep scooping, and give your pup an extra hug. They have no idea what you’re doing, but they love you anyway.