According to Dose My Pet, the common Xanax dosage for dogs is between 0.01 to 0.05 mg per pound. The Xanax dosage for an 11-pound dog is between 0.11 mg and 0.55 mg. Consultation with a veterinarian is recommended before administration to prevent any adverse reactions.
The ASPCA states that regular doses of Xanax provide mood stabilization, but high doses of Xanax can cause sleepiness, vomiting and impaired movement and thinking. It is best to administer Xanax to a dog before a stressful event occurs to reduce these side effects. It is especially important to administer the lowest effective dosage of Xanax to a dog with any preexisting conditions.