L-Theanine for Dogs

L-Theanine for Dogs

Posted by Lianne McLeod D.V.M. on

L-Theanine for Dogs

L-theanine, a naturally occurring amino acid found in green tea leaves, has gained attention for its potential benefits to promote relaxation and reduce anxiety in humans and pets. In recent years, dog owners have turned to these supplements, also found in black tea, to help their furry companions manage stress, ease anxiety, and control certain behavioral issues.

Theanine stands out due to its interaction with neurotransmitters in the brain, particularly glutamate, which plays a vital role in transmitting signals between nerve cells. While essential for normal brain function, an excess of glutamate can lead to overstimulation, contributing to anxiety and stress. This is where theanine's distinctive influence comes into play.

As an inhibitory neurotransmitter, L-Theanine promotes the release of gamma-aminobutyric acid (GABA), a crucial component in the brain's calming mechanisms. GABA acts as a natural tranquilizer, counteracting the effects of excitatory neurotransmitters and promoting an overall sense of relaxation.

The beauty of this compound is that it is natural, making it a great option for those seeking a holistic approach to easing anxiety in their dogs. It works by increasing the production of alpha waves and certain neurotransmitters, such as serotonin and dopamine, which play a role in mood regulation.

This article will explore the benefits, side effects, dosage, and safety considerations of L-theanine for responsible pet care.

l-theanine found in lolahemp calming oil

Why Should I Give My Dog L-Theanine?

General knowledge about the compound indicates several potential advantages for dogs. Below are a few reasons to administer this amino acid to your furry friend:

l-theanine may have calming properties for dogs

Calming Properties

One of the primary reasons pet owners turn to theanine for dogs is its potential to alleviate a dog's anxiety caused by phobias or other stressors. The best part is that it has calming ingredients without a sedative effect.

l-theanine has stress management properties

Stress Management

Many dogs experience stress in various stressful events, such as during vet visits, travel, or exposure to new environments and unfamiliar people. L-Theanine's calming effects assist in managing stress and promoting low blood pressure, contributing to an overall improved quality of life and a happier dog.

l-theanine has behavioral management properties

Behavioral Improvement

Dogs with behavioral issues, such as excessive barking, aggression, or hyperactivity, could benefit from theanine supplementation, which contributes to more balanced and manageable behavior by reducing excitability and inducing a relaxed state.

l-theanine may have properties that help dogs sleep

Better Sleep Quality

Dogs, especially those prone to anxiety, may have difficulty getting quality sleep. L-Theanine's ability to promote relaxation without making your dog drowsy may improve sleep quality and lower blood pressure, helping your furry canine rest more peacefully.

l-theanine may support dog cognition

Cognitive Support

While more research is needed in this area, some studies in rodents suggest that L-Theanine may have neuroprotective properties and potentially support cognitive function. It can cross the blood-brain barrier and reach the central nervous system. This could be particularly relevant for older dogs facing cognitive decline.

l-theanine has a non-sedative calming effect

Non-Sedative Calming Effect

Unlike some traditional sedative medications, theanine promotes relaxation without making your dog feel drowsy. This makes it an attractive option for those who want to calm their dogs without affecting their normal daily activities and keep them in an alert state.

l-theanine can support dogs through stressful situations

Support during Stressful Situations

Dogs often exhibit anxiety and fear during thunderstorms or fireworks. Theanine for dogs helps keep them calm in these stressful situations, making it easier for dogs to cope with loud noises and flashes of light.

l-theanine can be a complimentary help during therapy strategies

Complementary Therapy

L-Theanine can be used as part of a comprehensive approach to calm anxiety or tame behavioral issues in dogs. When combined with behavior modification techniques, proper training, and a supportive environment, this compound may enhance the overall effectiveness of the treatment plan.

minimal side effects of l-theanine

Minimal Side Effects

When administered at appropriate doses, theanine for dogs is generally well-tolerated, and the risk of adverse effects is low. This makes it a potentially attractive option for dog owners seeking natural alternatives with fewer side effects than some new medications.

Easy Administration

Theanine for dogs is often available in palatable supplement forms, such as flavored tablets or chews such as Calming Bites, making administration relatively easy. This is particularly beneficial for dog owners with canines that are picky eaters or difficult to medicate.

Side Effects of L-Theanine

It is generally considered safe for dogs and other animals when administered at appropriate doses. However, like any supplement or medication, there is a potential for side effects such as:

Gastrointestinal Upset

Some dogs experience mild gastrointestinal upset when first introduced to L-theanine. This may manifest as vomiting, diarrhea, or general stomach discomfort. It's advisable to start with a lower dose and gradually increase it while observing your dog for any signs of digestive issues.

Allergic Reactions

Although rare, dogs can have allergic reactions to certain substances, including L-theanine. Signs of an allergic reaction include itching, hives, swelling, or difficulty breathing. If you notice any of these symptoms, discontinue using L-theanine and seek immediate veterinary attention.

Changes in Behavior or Alertness

L-theanine is known for its calming effects, but in some extreme cases, dogs may react differently. A dog may become overly sedated or exhibit changes in behavior or alertness. Often, it will make your dog drowsy. If you notice extreme lethargy or any unusual behavior after giving your dog l-theanine, consult your veterinarian.

Interaction with Medications

If your dog is taking other medications, there is a possibility of interactions with theanine. Always inform your veterinarian about any supplements or medications your dog is receiving to ensure there are no adverse interactions that could affect your pet's health.

Individual Sensitivity

Dogs, like humans, vary in their sensitivity to different substances. Some dogs may be more sensitive to L-theanine than others. Individual factors, including breed, age, and overall health influence how a dog responds to the supplement.

Overdose Risk

Although taking L-theanine is generally safe, giving excessively high doses may increase the risk of adverse effects. Follow the recommended maximum dosage guidelines provided by your veterinarian or the product manufacturer. If you suspect an overdose, seek immediate veterinary attention.

L-Theanine Dosage Guidelines

How much L-theanine is considered appropriate for dogs? Determining the appropriate dosage depends on various factors, including the dog's weight, size, and the specific reason for administration. Below are some general recommended doses to consider:

l-theanine dosages for dogs
  1. Small Dogs (Under 20 pounds)

  • Start with a lower dose, such as 25-50mg per day.

  • Monitor your pet for any changes in behavior or adverse reactions such as an anxious dog.

  • If needed, the dosage can be adjusted under the guidance of a veterinarian.

  1. Medium-sized Dogs (20-50 pounds)

  • A moderate starting dose would be in the range of 50-100mg per day.

  • Observe your dog's response, and consult with your veterinarian to determine the optimal dosage.

  1. Large Dogs (50+ pounds)

  • Larger dogs may require a higher dose, such as 100-200mg per day.

  • Begin with a lower dose and gradually increase if necessary, based on your dog's response.

Tips for L-Theanine Administration

tips for administering l-theanine for dogs

Consistency is Key: Administer L-Theanine regularly, as consistency is crucial for achieving optimal results.

Start Low and Go Slow: Begin with the lower end of the recommended dosage and observe your dog for any reactions. If needed, the dosage can be gradually increased under the guidance of your veterinarian.

Observe for Side Effects: Keep an eye on your dog for any signs of gastrointestinal upset, allergic reactions, or changes in behavior. If you notice anything unusual, consult with your veterinarian.

Consider the Purpose of Use: The dosage may vary depending on the intended purpose of L-Theanine administration. For instance, a dog facing occasional stress will require a different dosage than a dog with chronic anxiety.

Safety Considerations

Ensuring the safety of your dog when using L-theanine supplementation involves the following considerations:

Consultation with a Veterinarian

Before introducing any new supplement, including L-Theanine, it's crucial to consult with a veterinarian. A veterinarian will assess your dog's overall health, consider any existing medical conditions, and guide the appropriate dosage for your specific pet.

Individual Sensitivity

Dogs, like humans, can vary in their sensitivity to different substances. Some dogs may be more sensitive to L-Theanine than others. Always start with a lower dose and observe your dog for any signs of adverse reactions.

Appropriate Dosage

Follow the recommended dosage guidelines provided by your veterinarian or the product manufacturer. Avoid exceeding the recommended dose, as this could increase the risk of side effects.

Monitoring for Side Effects

Keep a close eye on your dog for any sudden changes in behavior, gastrointestinal upset, or signs of allergies. Although this amino acid may be helpful for other dogs, the effects on yours may be negative. If you observe any adverse reactions, discontinue the use of L-Theanine and consult with your veterinarian.

Quality of the Supplement

Choose high-quality L-Theanine supplements specifically formulated for dogs. Look for products from reputable manufacturers that provide clear dosage instructions and list all ingredients. Avoid supplements with unnecessary additives or fillers.

Interaction with Medications

If your dog is currently taking any medications, inform your veterinarian before starting L-theanine supplementation. Some medications may interact with L-Theanine, and your veterinarian can help assess the safety of combining these substances.

Avoiding Overdose

While it is generally safe, excessive doses could lead to adverse effects. Stick to the recommended dosage and avoid the temptation to administer more than necessary.

Regular Veterinary Check-ups

Keep your veterinarian informed about your dog's overall health and any changes in behavior or condition. Regular check-ups can help ensure that the use of L-Theanine keeps your dog in good health.

Purpose of Use

Clearly define the purpose of using L-theanine for your dog, whether for its relaxing properties, anxiety management, keeping your dog calm and relaxed, or addressing specific behavioral issues. This information can help your veterinarian tailor their advice to your dog's unique needs.

Consideration of Pre-existing Conditions

Dogs with certain pre-existing health conditions may require special considerations. Conditions such as liver or kidney disease may affect how your dog processes supplements and your veterinarian can provide guidance based on your dog's specific health status.

Furthermore, theanine is not recommended for pregnant or nursing dogs, those with severe phobias, or separation anxiety.

Palatability and Formulation

Choose a formulation of the theanine compound that your dog finds palatable. Some supplements come in flavored chews or tablets that may be more appealing to dogs.

The Bottom Line

L-theanine, one of the active ingredients in green tea leaves and black tea, emerges as a promising supplement for dogs, offering a natural and gentle approach to address anxiety and reduce stress. This amino acid's ability to decrease anxious thoughts and induce a calming effect is attributed to its interactions with neurotransmitters in the brain, particularly glutamate.

Beyond its role in neurotransmitter modulation, theanine also acts as a precursor to gamma-aminobutyric acid (GABA), a neurotransmitter renowned for its inhibitory effects. This dual mechanism of interacting with glutamate receptors and fostering GABA release enhances theanine's reputation as a natural anxiolytic, offering a gentle approach to reducing stress and anxiety without a sedative effect.

Pet owners seeking alternatives to traditional medications find L-theanine particularly appealing due to its generally well-tolerated nature and minimal side effects. Its non-sedative qualities set it apart, allowing dogs to experience a sense of calm without compromising their alertness or daily activities.

The individualized nature of theanine supplementation allows for tailored approaches, with dosages adjusted based on a dog's weight, size, health status, and specific needs. As a part of a comprehensive strategy, L-Theanine complements behavior modification techniques and environmental adjustments, contributing to a holistic solution for less anxiety and stress management in dogs.

However, responsible pet care dictates consultation with a veterinarian before using theanine for dogs. The professional guidance ensures that the supplement aligns with the dog's overall health, considering any potential interactions with existing medications. 


  1. WebMD. (n.d.). Theanine: Uses, Side Effects, Interactions, Dosage, and Warning. WebMD. Retrieved from https://www.webmd.com/vitamins/ai/ingredientmono-1053/theanine

  2. Johnson, T. (2022, October 19). Is L-Theanine Safe for Dogs? Learn Now. Xen Pets. Retrieved from https://xenpets.com/blogs/daphnes-dog-blog/is-l-theanine-safe-for-dogs-learn-now#:~:text=L%2DTheanine%20has%20also%20been,and%20promote%20low%20blood%20pressure.

  3. Falconer, A. (2022, February 28). Is L-Theanine in the Diet Good for My Anxious Dog? Bestie Health. Retrieved from https://bestiehealth.com.au/blogs/ingredients/is-l-theanine-in-the-diet-good-for-my-anxious-dog

  4. The Zami Pet Team. (2022, July 22). L-Theanine for Dogs. Zami Pet. Retrieved from https://zamipet.com.au/blogs/pet-health-hub/l-theanine-for-dogs

  5. Ethical Naturals Inc. (ENI). (2020, June 1). Alphawave: L-theanine Supports Alpha Brainwave Activity, the Source of Wakeful Relaxation. NutraIngredients-USA. Retrieved from https://www.nutraingredients-usa.com/News/Promotional-Features/Alphawave-L-theanine-supports-alpha-brainwave-activity-the-source-of-wakeful-relaxation

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Lianne McLeod, DVM, is a former writer for The Spruce Pets, contributing articles for 11 years. Before Dr. McLeod began writing about pet care, she worked several years in small animal practice. She has written extensively about the care and keeping of exotic pets and pet health care. She now researches water quality and chronic disease at the University of Saskatchewan. Lianne McLeod earned her Doctorate of Veterinary Medicine from the Western College of Veterinary Medicine at the University of Saskatchewan. She also received a Bachelor of Science degree in biology from Simon Fraser University. She continued her education and received a Ph.D. in Epidemiology from the University of Saskatchewan. Now, she splits her time between her family, research and writing about pet health for all the animal lovers out there.

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