Welcome! I am Dr. Altman, a licensed veterinarian and happy to answer your questions today.
Unfortunately it is too late to induce vomiting if it has been 3 hours and it sounds like he is already showing signs of exposure if he had urinary incontinence.
According to the Pet Poison Hotline Common signs to watch for:
Low heart rate
Low blood pressure
In dogs and cats poisoned by marijuana, clinical signs can be seen within 3 hours, and include severe depression, walking as if drunk, lethargy, coma, low heart rate, low blood pressure, respiratory depression, dilated pupils, hyperactivity, vocalization and seizures. Vomiting is often seen with dogs despite the “anti-emetic” (anti-vomiting) qualities of THC.
If he is not rousable then please seek veterinary attention as soon as possible to help "flush" the marijuana out of his system and reduce the risk of the more severe reactions seen above.
1. It takes about 1.5 grams of marijuana per pound of body weight to cause death
(so for 15 pounds = 22.5 grams. So deaths from marijuana poisoning are not common.
2. But adverse symptoms such as animals becoming sleepy, vomiting, uncoordinated and having hallucinations or seizures are common, it is surprising how often dogs get access to this drug.
3. While there are no guarantees, the vast majority of dogs exposed to marijuana fully recover within 24 hours without any treatment. However some dogs would experience very bad symptoms and require hospitalization, and intensive care with IV fluids etc.
The golden rule though is do not take chances, if you are in any doubt then get a vet involved.
I hope this information makes sense but please let me know how else I can assist you both today
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