What is it

L-theanine is an amino acid found naturally in green tea and some mushrooms. And it’s been shown to improve mood, relieve stress, and improve sleep.

While safe in humans, it’s been proven to be safe in dogs too.

How it works

L-theanine works in the brain by increasing “feel-good” neurotransmitters (serotonin and dopamine) and increasing GABA levels. This results in improved concentration and sustained energy. And the higher levels of GABA help to create a relaxed, calming state.


L-theanine is safe for dogs. And it's a great alternative to prescription anti-anxiety medications like Prozac and Xanax. Because it’s an amino acid, there are no negative side effects and works within a few hours of taking.

Every dog is different so it’s best to discuss with your vet before starting L-theanine in your dog.


L-theanine is available in many forms like:

  • Bulk powder
  • Chews
  • Liquid
  • Chewable tablets

Bulk powders limit the addition of other ingredients. This allows you to experiment with the dose to achieve the desired response. Give more or less L-theanine depending upon the stressor.


L-theanine is usually given twice daily. But if needed, it can be given every 6 hours.

A rough dosing guide for dogs is as follows:

  • 10-20 lbs: 100 mg
  • 21-40 lbs: 200 mg
  • 41-60 lbs: 300 mg
  • 61-80 lbs: 400 mg
  • 81+ lbs: 500 mg

While there is no maximum dose for L-theanine, it’s best to start at a low dose. If your dog doesn't respond, add more L-theanine until the desired result is achieved.

When I used L-theanine in my pups, it didn’t take much. Within a few days of giving L-theanine, my dogs were less irritable. Situations that were stressful were handled with ease. It’s been so helpful for my dogs that I have incorporated it into their daily supplement regimen.

Talk with your vet and determine if L-theanine is right for your pup.