1.http://www.petmd.com/dog/parasites/how-dangerous-are-fleas
2.https://vcahospitals.com/know-your-pet/tapeworm-infection-in-dogs
3.http://www.vetstreet.com/care/anemia-in-dogs
4.http://www.petmd.com/dog/parasites/4-surprising-flea-diseases-you-need-know
5.https://www.cdc.gov/lyme/stats/tables.html
6.http://www.cnn.com/2017/05/23/health/tick-explainer/index.html
7.http://www.dogsnaturallymagazine.com/best-home-remedies-fleas/
8.https://www.petsafe.net/learn/10-ways-to-prevent-pests-naturally
9.http://npic.orst.edu/factsheets/degen.html
10.https://entomology.ca.uky.edu/ef602
11.https://www.wikihow.com/Clean-Dog-Bedding-With-Vinegar
12.http://herbs.lovetoknow.com/Rosemary_a_Natural_Flea_Repellant
13.https://www.motherearthnews.com/nature-and-environment/natural-flea-control-zmaz95asztak
14.https://www.avma.org/public/PetCare/Pages/Safe-use-of-flea-and-tick-preventive-products.aspx