1.https://vcahospitals.com/know-your-pet/slippery-elm
2.http://www.dogsnaturallymagazine.com/the-soothing-qualities-of-slippery-elm
3.https://pethelpful.com/dogs/Slippery-Elm-Bark-for-Dog-Diarrhea-and-Upset-Stomach
4.http://www.akc.org/content/health/articles/is-pepto-bismol-safe-for-dogs
5.https://wagwalking.com/wellness/slippery-elm-how-can-it-benefit-your-dog
6.https://www.whole-dog-journal.com/issues/5_5/features/5455-1.html
7.http://www.longwoodherbal.org/slipperyelm/slipperyelm.pdf
8.https://www.dogsupsetstomach.com/slippery-elm-to-treat-diarrhea
9.http://dogaware.com/health/digestive.html