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Are House Lizards Poisonous? (Or Just Rumors?)

If you have seen a house lizard, or have one, you may be wondering if they are poisonous or dangerous…

Are house lizards poisonous?

House lizards are not poisonous or venomous. However, they are known to bite in self-defense but the bites are not usually that bad. But, they are known, like most lizards, to have salmonella. Meaning, it’s important to wash your hands after any contact with them to avoid salmonella infection.

So, now you know. But, what happens if you touch a house lizard? Are these lizards poisonous to cats? And, what about dogs? Keep reading for these answers, and much more…

What happens if you touch a house lizard?

Are house lizards poisonous?

A house gecko.

If you touch a house lizard nothing spectacular is likely to happen. However, it is advisable to wash your hands to avoid the salmonella they have. There is also a chance it could bite you out of fear.

The reality is, these louse lizards, or geckos, look scarier than they are. They are not classed as dangerous lizards, especially when compared to large killers like the Komodo Dragon.

Are house lizards poisonous for cats?

House lizards are not poisonous to cats. This is because they are not poisonous in general. They have no venom either. However, this does not make them safe for cats. They can pass on salmonella or parasites.

The problem is cats are likely to put a lizard in their mouth. Whether they mean to bite or eat it there is contact with its mouth. Meaning, it’s easy to pass on an infection. Therefore, it’s advisable to keep your cat away from them, if possible.

Can house lizards harm you?

A house lizard is not like to cause serious harm. But, they can bite and cause some pain. In most cases, the shock of the bite may be scarier than the bite itself.

The bite, in the scheme of things, is not likely to be that bad. But, each person has their own individual pain threshold. Meaning, to me it could be nothing. But, to you, it could feel like a big thing, are you with me?

Are house lizards poisonous to dogs?

House lizards are not poisonous for dogs, or venomous. However, there is a chance of some bacterial infection or coming into contact with the lizard’s salmonella.

What is The Difference between poisonous and venomous?

If you bite it and you die then it is poisonous. Lizards are classed as venomous i.e. they can inject venom into your bloodstream when they bite you. However, there are very few lizards that are venomous mainly the Gila Lizard, and Mexican Beaded Lizards.

The first fact you need to know is that there is a difference between being ‘venomous’ and ‘poisonous’.In the simplest terms, if the creature bites you and you die, it is venomous.

This is a remarkable discovery in recent years as it can help scientists find out about the relationship between snakes and lizards.

Contrary to popular belief, Lizards are not poisonous though. Although they have a plethora of dangerous bacteria and viruses on their skin, they do not have poison on them.

Eating one might make you seriously sick, but it has nothing to do with poison.

What Happens If A Cat Tries To Eat A Lizard?

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If you eat a lizard since most lizards have some form of bacteria on their skin, chances are your cat might get sick. However, if the lizard was venomous, the cat might end up getting some sort of reaction to the toxins.

This involves severe vomiting, drooling, fever, staggering around, and looking dazed. It can further dim their hunger so they might even end up starving themselves.

If the toxins are at a higher concentration it can even lead to severe diarrhea and even paralysis. If it’s your cat that has been infected, then you might want to clean the mouth to ensure all toxins are gone and then check with a vet.

Try to identify the species of the lizard it might have eaten. Chances are your vet might have an anti-venom.

What Symptoms Can You Get If You Get Bitten?

If the lizard is venomous, then its bite can inject you with venom. This venom may not be as strong as some snakes, because it might not kill you. However, it can still cause you to be seriously sick.

Until recent years, it was thought that the swelling associated with lizard bites was due to the bacteria present on them. It was thought that this bacteria infected the wound.

However, it has been discovered that the swelling and bleeding is actually due to the venom.

Not only is this poison painful, but it can also reach life-threatening conditions as well. Kids are at the highest risk of more serious complications including death.

Symptoms usually vary on the type of venom but generally include pain, swelling, difficulty in breathing, tissue death, numbness, blurred vision, excessive bleeding, rapid pulse, diarrhea, convulsions, shock, paralysis, low blood pressure, and in the most serious cases, death.  Victims should be treated immediately.

Are There Dangerous Parasites That Live On A Lizard?

Since lizards live around trees and bushes, they are bound to catch some parasites. They may carry some microbes on their skin and even in their digestion tract.

These parasites may not necessarily be harmful to the lizard, however, they can be very harmful to their predators.

These can include germs such as Clostridium, Salmonella, and Campylobacter, etc. These can result in several diseases such as salmonella, Leptospirosis, Campylobacteriosis, Botulism, etc. Apart from germs, lizards are known to carry several smaller insects on their skins such as mites, ticks, and maggots.

These can infect your food and transfer to your hands easily any time that you touch them.

Why Do Lizards Bite?

Most lizards only bite to ward off any potential predators. Most lizards, like the Green Anole, will leave humans alone as long as they do not disturb them.

They do so to scare them away. Only two to four species of lizards are found to be venomous.

They use the venom to daze their predator so that they become distracted. This way the lizard can make their getaway. Even if the lizard is non-venomous, biting its predator will still cause a lot of pain to the attacker.

For humans, this is quite similar to pit viper venom, which might not kill them, but can cause a series of infections and conditions. The worst part is that, unlike snakes, lizards are hard to dislodge.

They continue secreting their venom for a long time. Most folks have to use pliers to remove it. They hold on so strongly that their teeth often end up broken and stuck in the human skin.

Do Lizards Carry Salmonella?

Most lizards do carry salmonella. Since they spend most of their time outside, their skin catches many harmful bacteria. One such germ is called salmonella. It can cause serious illnesses in people.

As we have already established that many lizards and even the house lizard are nonvenomous, however, they are still harmful to humans.

Thus, it is highly recommended that you wash your hands with anti-bacterial soap after handling animals. Salmonella can also be caused by handling lizard environments such as handling their water or food containers or even the terrariums that they live in.

It can result in several diseases such as salmonellosis which is evident by Nausea, vomiting, diarrhea, fever, chills, headache, blood in stool, and abdominal cramps.

So, be sure not to touch anything after touching your lizard and wash your hands as soon as possible.

If A Lizard Fell In Milk or Food, Would It Make You Sick?

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If a lizard fell in your milk or food, it could make you sick. This is because their skin can have salmonella or even parasites on it that can be harmful to humans. So, if the lizard fell in any food, it is likely to transfer this into the food.

However, if the food was to be cooked later, it may kill the germs or bacteria so it might be safe to eat such food. If the food was ready-made then, it would mean that the germs would not be eliminated before ingesting.

Although you could eat the food after cooking it, I don’t recommend it anyway! Not many people would like to eat it either!

Which Lizards Produce Venom?

The Gila Monster and the Mexican beaded lizard are known to produce venoms in their bodies. When these lizards bite another animal, it releases the venom from the para mandibular sack that is present behind their teeth.

The venom mostly contains neurotoxins that can paralyze or cause hallucinations. However, very few cases have been reported. The venom is called the helodermatid venom which includes substances such as serotonin, hyaluronidase and gilatoxin, and helothermine. Gilatoxin is the main neurotoxin found in most Gila Monster and Mexican beaded lizards.

It can cause convulsions, restlessness, lethargy along with paralysis, and even death.

Apart from these, very few lizards might have toxins, however, these are still to be known.

What Is Venom?

Venom is a poisonous or toxic substance that is secreted by many animals including snakes, scorpions, spiders, bees, wasps etcetera. It contains one or more than one toxin and usually causes harm to animals that it is injected into.

Some animals such as bees use it as a defense mechanism to try to discourage any potential predators, while others use it to attack their prey such as snakes and spiders.

The venom contains any of the four types of toxins: Necrotoxins (causing instant death), Cytotoxin (causing cell death), Neurotoxins (affects the nervous system), and mycotoxins (damage muscles).

Venomous animals are those which can secrete venom and inject it into their victims through their teeth or a stinger. These animals are responsible for killing thousands of humans every year. However, research has found that the toxins might be able to treat diseases.


All in all, lizards are mostly harmless. Only a few species are known to be poisonous or venomous (Click here to see if read-headed Lizards are poisonous). However, this does not mean you shouldn’t look out for these species.

If you live in an area that is frequently inhabited by lizards, you might want to check if some of them are poisonous or venomous. Next, you might want to ensure what kind of anti-venoms are present at your local hospital or vet clinic. This will help you respond quickly to any emergencies.

Even with non-venomous lizards, you should be careful as they are known to cause cross-contamination. Be sure to wash your hands with a good anti-bacterial soap when handling them. And keep the kids away from them!


Hi, this is me with my daughter and my Lizard friend. I hope you enjoy my research. Please feel free to check out my "About Me" page to find out more about me.