It wont hurt them except for the imediate burning when you spray it on.
I did have a vet tell me a while back not to use it as it causes the wound to scab and harden up and hold in fluids that need to drain. Makes sense to me, I have started using furizone and have been pleased w/ it. Keeps the wound greesy like neosporin. I know that isnt what you asked for but thought I would throw it out there.