Is your Dog a Stoner?
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.
Italicized extract from: https://www.google.com/amp/s/www.buzzfeednews.com/amphtml/mbvd/everything-you-need-to-know-about-marijuana-and-your-dogs
Effects of marijuana on dogs:
Lower blood pressure
Abnormal heart rhythms
Loss of balance