Hmmmm....good question, sandyrivers. I've not seen anything to indicate that they're toxic. Not sure about cats, but we've used it around our dogs (from puppyhood on up) as needed for decades and never had a problem. I've had less luck eliminating odors with homemade remedies than with the enzymatic cleaners, so I've always stuck with them...
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."