I don't know about cats, but for rabbits absolutely, my father had sprayed my section when we owned a rabbit many years ago, the wind had made it go further than it should have and lickrish got poisoned, she was only a baby and thank goodness survived it, but it was horrible , and i sure learned a lesson from that, no sprays are allowed outside at all in my section, i prefer to live with weeds, of course the council spray the outside and that is always a worry, but so far so good, just be very careful.,you can always use boiling water on weeds, that works ,makes them die, then pick them out, that is my preferred option, or alternative safe non toxic products.