Gabapentin belongs to a class of Anticonvulsant. Its name is derived from the GABA which is a short for Gamma amino butyric acid, a neurochemical responsible for pain present in our central nervous system. It can be used for the treatment of migraines and epilepsy. For humans it works by increasing the activity of the GABA in CNS and spinal cord, but incase of dogs,It works by blocking calcium channels in the brain to suppress overly stimulated neurons that cause anxiety, nerve pain, and seizures. 

Regarding how much we can give to a dog can vary, but usually, gabapentin is dosed at 5 to 30 mg/kg (or 2.2 to 13.6mg/lb) up to three times daily. Gabapentin can also be given before an anticipated stressful event, such as a veterinary visit, at a dose of 30-60 mg/kg one to two hours before the event.

side effects like Dizziness, Loss of balance, Diminished coordination, Tremors, Eye problems, including double vision, Sleepiness, Hyperactivity, Confusion and Diarrhea are possible so be cautious, use it under the strict instruction and guidance of a medical expert. There is a high probability of getting addicted to the drug so don't use it for the prolonged period of time. 

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