Will this interfer with their invisible fence collars?

    I wouldn't know the answer to that for sure - but would not
    hesitate to use with an invisible fence. This is not an electric
    type mechanism but rather one of kinetic energy - thus based
    on the dogs movement...as they move they create body energy
    and the tag works to keep critters away...not related to any
    electrical devices etc. I believe on the Shoo Tag site you can
    reach out to them and there are FAQ's, I'm sure they can
    clarify 100%.

Where, again, was the possibility to opt out of being human? I really should’ve had been paying more attention.