Can Dogs Have 10mg Melatonin? A Complete Guide for Worried Pet Parents

September 23, 2025 |

Rob writes about the intersection of sleep and mental health and previously worked at the National Cancer Institute.

Melatonin is known for its role in helping people sleep, but this hormone also affects animals. Although research is limited, melatonin supplements are generally believed to be safe for dogs, and veterinarians may suggest melatonin supplements to help dogs with sleep problems, behavioral issues, and medical conditions.

For pet owners, it can be helpful to learn more about melatonin for dogs, including when to use it and how much to give. Pet owners should also know about the importance of working with a veterinarian and choosing a quality supplement.

Are you struggling with a doggo who just can’t seem to catch those z’s at night? Maybe your furry friend gets super anxious during thunderstorms or fireworks? You might have heard about melatonin as a possible solution and now you’re wondering – can dogs have 10mg melatonin?

As a pet parent myself I totally get it. We want the best for our four-legged family members, and seeing them stressed or unable to sleep well is heart-breaking. Let’s dig into everything you need to know about giving melatonin to your canine companion!

What Exactly Is Melatonin?

Before we jump into dosages, let’s understand what this stuff actually is.

Melatonin is a natural hormone that both humans and dogs produce in their pineal gland (located in the brain). It helps regulate sleep-wake cycles and is often called the “sleep hormone.” The body naturally produces more melatonin when it’s dark outside and less when it’s light – which is why it helps us (and our pups) feel sleepy at night.

Can Dogs Take Melatonin?

Yes, dogs can safely take melatonin at appropriate doses – but there’s a big asterisk here that we need to discuss.

It’s best not to give your dog melatonin supplements made for people. Human products can contain ingredients that are harmful to pets, like xylitol. This artificial sweetener is extremely toxic to dogs and is sometimes found in gummy or chewable melatonin formulations made for humans.

When Might Melatonin Help Your Dog?

Melatonin isn’t just for sleep issues. Veterinarians sometimes recommend it for:

  • Anxiety and stress – particularly for thunderstorms, fireworks, or separation anxiety
  • Sleep disturbances – especially in older dogs with canine cognitive dysfunction (doggy dementia)
  • Hair loss conditions – including alopecia X, seasonal flank alopecia, and pattern alopecia
  • Some autoimmune disorders – there are anecdotal reports of benefits for immune-mediated thrombocytopenia

Is 10mg of Melatonin Safe for Dogs?

Here’s where we need to be careful. A 10mg dose is generally too high for most dogs, especially small and medium breeds.

Appropriate melatonin dosages depend on your dog’s size and the specific condition being treated. While there’s no established toxic dose (meaning it would take a very large amount to cause a true overdose), giving too much can lead to unwanted side effects.

General Dosage Guidelines

The dosage should always be determined by your veterinarian, but here are some general guidelines:

  • Small dogs (under 10 lbs): 1 mg
  • Medium dogs (10-25 lbs): 1.5-3 mg
  • Large dogs (26-100 lbs): 3-6 mg
  • Giant dogs (100+ lbs): 3-9 mg

As you can see, a 10mg dose would exceed recommendations even for very large dogs in most cases. This is why it’s super important to talk to your vet before giving any supplement to your pet.

Potential Side Effects of Melatonin in Dogs

While melatonin is generally considered safe, giving too much (like 10mg to a small dog) could increase the risk of side effects, which may include:

  • Drowsiness or lethargy
  • Digestive upset
  • Increased heart rate
  • Itchiness or confusion
  • Fertility changes (not recommended for breeding dogs)

How to Safely Give Melatonin to Your Dog

If your vet has recommended melatonin for your pup, here are some important tips:

  1. Always consult your vet first – They can provide guidance on the appropriate dosage and whether melatonin is suitable for your dog’s specific situation.

  2. Choose pet-specific formulations – Look for melatonin products specifically made for dogs, or at minimum, pure melatonin supplements without harmful additives.

  3. Check the ingredients carefully – Avoid products containing xylitol or other artificial sweeteners.

  4. Look for quality assurance – Products with the USP (United States Pharmacopeia) seal have been verified for quality and components.

  5. Time it right – For anxiety-related issues, give melatonin 1-2 hours before the anticipated stressful event.

  6. Be patient – For hair loss conditions, it may take 2-3 months to see results.

Melatonin Drug Interactions

Another reason to check with your vet before giving your dog 10mg (or any amount) of melatonin is potential interactions with other medications. Melatonin may interact with:

  • Blood pressure medications like clonidine
  • Calcium channel blockers like amlodipine and diltiazem
  • Blood thinners like warfarin
  • Corticosteroids and other immunosuppressive drugs
  • Serotonergic medications (as melatonin can be converted back to serotonin)

Alternatives to Melatonin for Dogs

If you’re hesitant about giving your dog melatonin or your vet advises against it, there are other options for addressing anxiety and sleep issues:

  • Behavior modification techniques – Working with a certified behaviorist
  • Environmental management – Creating a calm, safe space for your dog
  • Other natural supplements – Such as L-theanine, chamomile, or valerian root (always with vet approval)
  • Prescription medications – For more severe anxiety or sleep disorders

FAQs About Melatonin for Dogs

Can puppies take melatonin?

While melatonin is generally safe, always consult with your vet before giving supplements to puppies. Their developing bodies may respond differently.

How long does melatonin take to work in dogs?

Melatonin typically starts working within 30-60 minutes after administration.

Can I give my dog melatonin every day?

Daily use may be appropriate for some conditions, but should be monitored by your vet to ensure continued safety and effectiveness.

Will melatonin make my dog sleep all day?

No, when used at appropriate doses, melatonin shouldn’t cause excessive daytime sleepiness. If your dog seems unusually lethargic, the dose may be too high.

Can melatonin help with thunderstorm anxiety?

Yes, many pet owners find that melatonin helps reduce anxiety during storms, but it’s usually most effective when given before the storm begins.

My Experience with Melatonin for Dogs

I’ve personally used melatonin for my senior Labrador who started getting restless at night due to cognitive changes. After consulting with our vet, we started with a conservative dose of 3mg (not 10mg!), and it made a noticeable difference in his ability to settle down and sleep through the night.

What I found super important was making sure to give it about an hour before his normal bedtime, and using a plain tablet form rather than the gummies I take myself (which could contain xylitol).

The Bottom Line on 10mg Melatonin for Dogs

While melatonin can be a helpful supplement for dogs with certain conditions, a 10mg dose is likely too high for most dogs. The appropriate dose depends on your dog’s size, health status, and the specific condition being treated.

Always consult with your veterinarian before starting your dog on any new supplement, including melatonin. They can provide personalized advice on dosage and help monitor your pet for any potential side effects or interactions.

Remember, what works for humans doesn’t always work the same way for our canine companions, and their safety should always be our top priority!

Have you used melatonin for your dog? I’d love to hear about your experience in the comments below!

can dogs have 10mg melatonin

Are Melatonin Gummies Safe for Dogs?

While melatonin is safe for most dogs when using an appropriate dose, some supplements can include other ingredients that may pose health risks. Melatonin gummies designed for humans often contain xylitol and other ingredients considered toxic to dogs.

Additionally, some gummies may not contain the right amount of melatonin for dogs. In fact, research has found that melatonin supplements vary in quality, and some may contain a different amount of melatonin than what is listed on the package. For this reason, it is best to talk to a veterinarian about finding a high-quality melatonin supplement.

Melatonin Dosage Chart for Dogs

The right dose of melatonin depends on several factors, including a dog’s weight and medical needs . For these reasons, it is important to talk to a veterinarian for support in finding the right dose of melatonin for any specific dog.

When giving melatonin for anxiety or as a sleep aid, the dose of melatonin is determined by a dog’s weight. Some experts suggest giving a dog melatonin every 8 hours at a dose of 0.1 milligrams of melatonin for each kilogram of the dog’s weight.

Dog Size Weight Melatonin Dosage
Extra Small Less than 5 kilograms 0.5 milligrams every 8 hours
Small 5 to 15 kilograms 0.5 – 1.5 milligrams every 8 hours
Medium 15 to 50 kilograms 1.5 – 3 milligrams every 8 hours
Large 30 to 50 kilograms 3 – 5 milligrams every 8 hours
Extra Large Over 50 kilograms 5 milligrams every 8 hours

Can I give my dog 10 mg of melatonin?