The impact of the weed on the dogs varies greatly depending on the weight and body size of the animals, Dr. Robin Downing, a Colorado doctor of veterinary medicine who is also a certified pain and rehabilitation practitioner, told BuzzFeed.
Dogs can also get high from secondhand smoke, just like a person can. Again the dog's size plays a role, but how high the dog gets depends on the concentration of smoke and how long the exposure is to the smoke.
Effects of marijuana on dogs:
Lower blood pressure
Abnormal heart rhythms
Loss of balance