Here is everything YOU need to know about marijuana toxicity in dogs. 🌳 Most marijuana toxicity occurs after a dog ingests homemade special baked goods, but some will eat the plant itself. It usually takes about 30 minutes for a dog to start showing signs of toxicity, but it may even take up to a few hours. The most common sign is ataxia, or difficulty walking, or standing. Many dogs also have increased sensitivity to motion, sound, or touch. This may be evident by them being easily startled, o