Dog Ate Chocolate – Symptoms, Toxicity, And What You Should Do


My dog ate chocolate! Chocolate can be toxic for dogs. So, if your dog has ingested a lot of chocolate, the best thing to do is speak to your vet straight away. Especially if your dog is small. But, if your dog is a larger breed and only ate a small amount of chocolate, it is most likely not a medical emergency. No matter your dog’s size, if they have eaten dark chocolate speak to your vet straight away.

Let’s take a look at what happens when dogs eat chocolate, and when to call the vet.

My Dog Ate Chocolate Contents

To jump straight to a section further down, just click the links below.

There are lots of factors to look at if your dog ate chocolate. As, not every instance is as urgent as the next. Let’s take a closer look at why this is.

My Dog Ate Chocolate – Differences in Situation

You’re probably here reading “My Dog Ate Chocolate” because you’re worried. But, whether or not a dog will have a reaction from eating chocolate depends on three things.

  • What type of chocolate your dog ate
  • How much your dog ate
  • How big your dog is.

How These Influence The Situation

If your adult Lab just ate a small square of milk chocolate, a cupcake with some chocolate icing, or a chocolate chip cookie, there is no need to panic. The chances are this is not a medical emergency. If your dog is small, or ate much more chocolate than that, you should take action. Don’t just ignore the fact that your dog scoffed a load of Hershey bars. There is a possibility that he or she could need medical attention within the next hour or so.

Dark chocolate is the most dangerous type of chocolate for your dog. So, if your puppy has eaten dark chocolate, call your vet’s office right now and let them know. They will want to know roughly how much your dog weighs and exactly what he just ate.

Before we get down to facts, let’s make it clear that this information is provided for your interest only. You should always contact your vet for advice if your dog has eaten anything you know or believe to be poisonous to dogs. And that includes chocolate.

Is Chocolate Bad for Dogs?

Chocolate is certainly not GOOD for dogs. It has nothing in it that dogs need and quite a few things that dogs don’t need. But is chocolate bad for dogs? Or are the risks exaggerated?

Sadly, according to a study on household food items toxic to dogs and cats, published in 2016, they are not. “The presence of chocolate was noted in the 10 most common cases of toxicosis involving dogs reported to the VPIS and to the American Society for the Prevention of Cruelty to Animals (ASPCA), Animal Poisons Control Center (APCC) in the past few years,” the study says.

my dog ate chocolate

In fact, vets have long known that chocolate is poisonous. They see many cases of chocolate toxicosis in dogs. Especially during the holiday season when people are more likely to leave chocolate products lying around. So, the answer is that, in sufficient quantities, chocolate and dogs don’t mix well at all. In fact, chocolate can be very bad for dogs. Let’s find out why that is.

Why is Chocolate Bad for Dogs?

The main harmful element of chocolate is a chemical called theobromine. The chemical code of theobromine is C7H8N4O2. There are other ingredients in chocolate that are also not great for dogs, such as sugar. And in many types of chocolate, milk is a key component. But it is the chemical called theobromine that causes the most trouble.

Theobromine is a vasodilator. That means it widens your blood vessels. You might think that’s a good thing—improving blood flow—and in some cases, it can be. In the past, for example, theobromine has been used to treat high blood pressure in humans. But theobromine is also a diuretic (makes you pee more) and a heart stimulant. Unfortunately, in large enough quantities, it is harmful to almost any animal that consumes it.

The chances of getting theobromine poisoning or chocolate toxicosis depend partly on how quickly the theobromine is broken down by the body. And that is where the problem lies for our dogs.

Why Can’t Dogs Eat Chocolate?

Despite the presence of the chemical theobromine, most humans suffer no ill effects from eating chocolate. Most, but not all. Chocolate toxicity does occasionally occur in people who consume large enough quantities. But chocolate poisoning in dogs is far more common. The reason is that theobromine is broken down far more slowly by the canine body. This chemical can actually stay in your dog’s bloodstream for up to 20 hours.

So, let’s take a look at what will happen if your dog ate chocolate.

What Happens if my Dog Ate Chocolate?

If a human eats anything with theobromine (coffee also contains this chemical) the quantity of theobromine ingested will be halved within 6 to 10 hours. So, for the most part, people can consume chocolate without severe side effects. But, if your dog ate chocolate today, it would take around 18 hours for theobromine levels to be halved. Because the dog metabolizes theobromine so slowly, the higher levels in the dog’s body can do more harm.

The theobromine in chocolate interferes with a dog’s heartbeat. This can cause potentially fatal disruptions or irregularities to his heart rate. It also stimulates the dog’s nervous system, causing a number of dangerous symptoms. We will look at symptoms of chocolate poisoning a little further down. But, click here if you need to go straight to this section.

How Much Chocolate Can Dogs Eat Safely?

How much chocolate can a dog eat safely? It depends partly on how much that dog weighs. For example, if a 60 pound Labrador ate 6 oz of milk chocolate, the risk of illness is low. In smaller dogs, eating chocolate is more serious. The same quantity might well kill a dog weighing 15 lbs or less. Don’t let anyone give chocolate of any kind to small breed dogs or puppies of any breed.

Many people get away with feeding milk chocolate or milk chocolate products, in small to moderate quantities to big dogs. You probably know someone who regularly does this. But, it doesn’t mean that they should. Or that the dog doesn’t feel unwell afterward. They are just unlikely to end up at the vet’s office. The same is most definitely NOT true of dark chocolate. This is the scary part. Let’s find out more about fatal amounts and types of chocolate.

What is a Fatal Amount of Chocolate?

Looking again at our example above. Let’s take the same 60 lb Labrador. And the same 6 oz quantity chocolate, but this time of dark chocolate. Now you’re looking at a very different scenario. The consumption of more than a couple of ounces of dark chocolate by an adult Lab should always be considered to be a medical emergency. Severe illness (and possibly death) is one potential outcome.

But why is dark chocolate so bad? Well, the darker your chocolate, the higher the theobromine levels! So, dark chocolate is naturally the most dangerous for dogs. Milk chocolate could also be harmful, but usually in greater quantities than would be needed for dark chocolate.

My Dog Ate Chocolate

White Chocolate

You may have heard that dogs can eat white chocolate without coming to any harm. And there is some truth in that rumor. White chocolate contains less theobromine than milk chocolate. And a dog needs to consume even more of it to become sick. However, it does still contain theobromine and high levels of sugar. So, it isn’t entirely safe. Especially for smaller dogs and puppies.

Fatal Doses Differ

The main point to take away from this, is that there’s no way of predicting beforehand how much chocolate will harm your dog. So it’s best not to risk letting your dog have any. Smaller dogs will need smaller amounts of chocolate before they are hurt, or even die. And, dark chocolate is much more dangerous than milk or white chocolate. So, your dog can be hurt, or killed, from much smaller amounts of dark chocolate.

Symptoms of Chocolate Poisoning

Early symptoms may vary from dog to dog. But most dogs will experience some common ones. Here are some common early symptoms of chocolate poisoning:

  • Increased thirst (theobromine is a diuretic)
  • Restlessness
  • Vomiting
  • Diarrhea

After that, if a sufficient quantity of theobromine has been consumed, things may get much worse. If a dog ate a lot of chocolate, he may lose control of his legs and collapse. He may also have a seizure, and if untreated may fall into a coma. Fatalities can and do occur.

When do Symptoms Start to Show?

If your dog ate chocolate in a large enough quantity to harm himself, symptoms will likely appear within 12 hours. Possibly much sooner. However, a dog that is perfectly well 24 hours after consuming some milk chocolate, is unlikely to suffer any serious consequences later. If you’re noticing any abnormal behavior after your dog ate chocolate, the best thing to do is speak to your vet.

What to do if Your Dog Eats Chocolate

The first thing to do is decide whether there is any risk at all of chocolate toxicosis. According to the MDS Vet Manual, a dose of 20mg/kg of body weight is the point at which there is a potential for clinical signs of illness. I’ll explain how you can find out what this means for your dog in a moment.

If your dog is at risk, then contact your vet to let him know what has happened. Be ready to make arrangements to take your dog in for treatment quickly if that is what your vet advises. Ultimately, everything will depend on the weight of the dog and the type of chocolate he ate.

My Dog Ate Chocolate

My Dog Ate Chocolate – First Actions

You’ll need to head over to a dog chocolate calculator. The one we recommend is in pounds and ounces. Write down how much your dog weighs in lbs. Weigh him if you have no idea. Then, write down approximately how much chocolate your dog has eaten in ounces. Go to the dog chocolate calculator on the Vet Manual website. Enter the color of the chocolate your dog consumed, his body weight in lbs and the weight of the chocolate in ounces. The calculator will tell you whether or not your dog is at risk.

You should make sure to contact your vet immediately if:

  • The calculator says your dog could be at risk
  • Your dog is very young or in ill health
  • Your dog shows any concerning symptoms

My Dog Ate Chocolate – What will the Vet Do?

You may wonder: But what can the vet do if my dog ate chocolate already? Good question. To treat chocolate poisoning, vets will usually try to cause your dog to vomit (if he hasn’t already). They’ll also give activated charcoal. This helps prevent the poison from getting absorbed into the dog’s stomach. You should not try to make your dog vomit by yourself.

Vets will then give fluids to counteract all the peeing caused by theobromine, and to avoid dehydration. Depending on how sick your dog has gotten, they may either treat the seizures or manage the diarrhea. It’s normal to be worried about your furry family member, but try to stay as calm as possible. If caught early enough, most dogs can recover from chocolate toxicity.

How to Stop my Dog Eating Chocolate

While we all wish we could always keep an eye on our dogs, it’s not that easy. Still there may be a few things you can do. First, and perhaps the simplest is to keep chocolate away from your dog. Place your “strictly human treats” out of your dog’s reach.

If you’ve got a dog who always seems to find his way around everything (like mine), you might need more. You could try keeping him in a crate. Crates are a great way to keep dogs safe when you can’t watch them. Just remember not to leave them in there too long. Experts recommend 4 hours for dogs older than 6 months and 2 hours for pups.

Training is the Easiest Way

Finally, teaching dogs a strong “leave it” command can be very helpful. My friend uses that when her dog tries to eat food that falls off the table. So if your dog does happen upon some chocolate and you’ve got your eyes on them, this might work. This video has some great tips for teaching a dog to “leave it.” Hopefully, it saves you from a “My dog ate chocolate” Google search.

Other Products to be Wary Of

Remember that bars of chocolate are not the only source of theobromine. It is also found in garden mulches made from cocoa plant products. But the most dangerous quantities are in cooking chocolate and cocoa powder. If you own a dog—especially a small dog—then these products should be safely and securely stored. Just like you would keep any other dangerous chemical out of reach of small children and dogs.

A helpful site for any kind of pet poisoning worry is the Pet Poisons Helpline.

My Dog Ate Chocolate – Summary

It isn’t a myth. Chocolate is indeed poisonous to dogs. Most poisonings are not fatal, but some are. So if your dog ate chocolate, you need to take it seriously. The risk is high if your dog is small, or if the chocolate he ate is dark. Don’t take chances. Be safe and contact your vet. And when Christmas or the holiday celebrations involve chocolate, spare a thought for your dog and keep those goodies stored safely out of reach. You can also keep your dog in a crate for a couple of hours if you’re going to be out. And a good “leave it” training won’t hurt either.

This article has been extensively revised for 2020

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Want to find out more about keeping your dog healthy?The Labrador Handbook

Then check out The Labrador Handbook. A complete guide for Labrador owners.

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