What do dryer sheets contain, you may ask? From Chemical & Engineering News (I read ‘em all)
Most dryer sheets are made from a nonwoven polyester material coated with a softening agent that has a long hydrophobic chain. Fatty acids, fatty alcohols, and alcohol ethoxylates are all possible softening agents. P&G uses quaternary ammonium salts of fatty acids as its primary softening agents, whereas Unilever, which produces Snuggle dryer sheets, uses a stearic acid.
Think about your dog licking herself after being wiped down with one of these sheets. Yuck. How about you skip the dryer sheets completely and just wipe your dog with an old towel. Who “thinks” of this stuff?