I'm going to spray weed killer in my yard
Why are you going to spray weed killer in your yard?
I need to kill weeds. It's not my fault if some animals get sick from it.
You should find a safer way to remove weeds. There's plenty of other methods.
It's safe for me. I'm not going to get sick.
It might be safe for you, but like you said, animals might get sick if they ingest it. You should think about using something that will get rid of the weeds but is non-toxic to animals.