IMO bike bells are not a good idea.
You hear one..what message is it giving?
Out the way please.
I'm coming up behind.
Both?
So what do you, as the pedestrian?
Most, try to get out the way. But, there's a fifty fifty chance that they move the same way you were intending to go.
As a cyclist, but when walking, when I hear a bell, I stop and stay still, until the bike has gone. i do this because i know that that is what I'd prefer a ped to do, were I on my bike.
Far better to call in a friendly voice "Bike coming through on your right/left!" ...followed by a "Thank you" after.
You won't always get it right. There are always those who are determined to be miserable and cantankerous. Ignore them.
At least you've been cheerful, courteous and done your best to ensure their and your safety.
For dogs and children, slow right down and be extra careful. After all, what's a few more seconds on your journey?