1.https://vcahospitals.com/know-your-pet/bloat-gastric-dilatation-and-volvulus-in-dogs
2.https://www.vin.com/veterinarypartner/default.aspx?pid=19239&id=4951346
3.http://www.petwave.com/Dogs/Health/Gas/Causes.aspx
4.https://vcahospitals.com/know-your-pet/flatulence-in-dogs
5.https://www.vetwest.com.au/pet-library/flatulence-farting-and-gas-problems-in-dogs
6.http://www.petguide.com/health/dog/5-benefits-of-feeding-your-dog-a-raw-diet
7.https://www.vetinfo.com/remedies-dog-flatulence.html
8.https://www.ncbi.nlm.nih.gov/pubmed/11294313
9.http://www.vetstreet.com/our-pet-experts/need-to-switch-your-pets-food-here-are-key-steps-to-take
10.https://www.cesarsway.com/dog-care/health-care-issues/Silent-but-deadly
11.http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2856