This will get ignored, but here goes:

Spunky and sams lick the shower/tub so I don't use chemicals unless I can lock the bathroom. I also rinse it well to remove shampoo residue.

As for leather: true unadulaterated rawhide might be less of a problem (and uncomfortable), but she should consider all of the chemicals used to condition the leather for use in furniture. Spunky and Rosie (RB) threw up from eating store brand food, so vomiting from licking the poisons off of leather or vinyl would be a logical conclusion.

Anne