Why does my dog eat grass?
Although itβs a common belief that dogs eat grass (or other plants) when they feel sick or to induce vomiting, a study published in Applied Animal Behavior Science back in 2008 indicated otherwise.
After reviewing a large sample of surveys from owners regarding plant-eating behaviors in their dogs, the results showed that only a small portion of dogs appeared sick before (or shortly after) eating grass. Most dogs in the surveys were fed a balanced diet, so eating grass was likewise not an attempt to compensate for nutritional deficiencies.
The study concluded that eating grass is normal behavior for dogs, and is seen in both wild and domestic dogs.
https://www.sciencedirect.com/science/article/abs/pii/S0168159107001827
91 years ago, there was a diptheria outbreak in Nome, Alaska. Nome's only hospital had almost no diphtheria antitoxin, and the last supply ship to reach Nome before winter had none on board. The only way to get the medicine to Nome was a daring sled-dog relay, led by a dog named Balto (whose statue is memorialized in New York's Central Park). Listen to the fascinating story in this podcast by HowStuffWorks: http://podcasts.howstuffworks.com/hsw/podcasts/symhc/2014-12-17-symhc-nome-syrum-run.mp3