Pet safe weedkiller for brick path

We have a lovely old, original to our house, brick path which has gaps between. We have tried putting sand in between, copious amounts of vinegar, but still the weeds come back. I have looked at the popular packets on the market but having pets worries me.

As our cat sits out on the path, and our dog walks up and down it every day, and they groom theirselves, including feet, does anyone have any recommendations for a weedkiller to kill the weeds that pop up on a very regular basis, whilst not killing the pets?
Carolbee

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