We always keep our dogs in for at least an hour or two after the Terminix guy has sprayed the yard, just to be sure it is safe. We don't use any kind of weed killer anyway; so that is not an issue. Usually, if you keep weeds mowed short and they can't go to seed, the grass will grow faster than the weed and take over the lawn.
When I had horses, the opposite thing happened; the horses ate the grass and left the weeds, and then the weeds took over. I had to move the horses, and keep the weeds mowed really short so that the grass would come back.
As far as keeping wandering cats out of the yard; that might be pretty hard to do, since cats go pretty much wherever they want to.
If you can use a non-toxic weedkiller, then you would not have to worry about the dogs and cats.
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