At what age did you feel safe leaving your child around your dog unsupervised?

I have a 3 year old beagle mix and a 1 year old toddler. The beagle wants to play with the toddler, but hasn’t learned how to play toddler-level gentle yet. The toddler wants to play with the beagle, but also hasn’t learned gentle hands yet. I think it’s going to be *a while* before they understand each other. How old were your kids when you felt safe not being there 100% of the time to moderate their behavior? I’m thinking somewhere between 5-10 years old, but may be way off…