Dogs bring companionship, exercise, and plenty of happiness into our lives. They share our homes, beds, yards, and sometimes even our meals. Although living with a dog is generally safe for healthy people, dogs can occasionally carry organisms that can infect humans.

Diseases that can naturally pass between animals and people are called zoonotic diseases. They can be caused by viruses, bacteria, fungi, parasites, and other organisms. Some are uncommon, while others can be prevented through routine veterinary care, good hygiene, parasite control, and vaccination.

The goal isn’t to be afraid of your dog. Instead, understanding potential risks can help you make sensible decisions about hygiene and preventive care.

Here are 13 infections and diseases that can potentially be associated with dogs and human transmission.

1. Rabies

Rabies is one of the most serious diseases that can pass from infected animals to people. It is caused by a virus that affects the nervous system and is usually transmitted through the saliva of an infected animal, most commonly through a bite.

Once clinical symptoms develop, rabies is almost invariably fatal. Fortunately, exposure can often be prevented from progressing to disease when appropriate post-exposure treatment is started promptly.

How dogs can be involved

An unvaccinated dog exposed to rabies can become infected and potentially transmit the virus through a bite.

How to reduce the risk

• Keep your dog’s rabies vaccination up to date.
• Avoid contact between your dog and unknown or wild animals.
• Keep your dog under appropriate control outdoors.
• Teach children not to approach unfamiliar animals.
• Seek urgent medical attention after a potentially rabies-exposing bite or scratch.

If you are bitten by a potentially rabid animal, don’t wait for symptoms to appear before seeking medical advice.

2. Ringworm

Despite its name, ringworm has nothing to do with worms. It is a fungal infection affecting the skin, hair, or nails.

Dogs with ringworm may develop circular areas of hair loss, scaling, crusting, or irritated skin, although signs can vary.

Humans can develop itchy, scaly skin lesions after contact with an infected animal or contaminated objects.

How it spreads

The fungus can be present on:

• Infected fur
• Skin flakes
• Bedding
• Brushes
• Towels
• Other contaminated surfaces

Prevention

If your dog is diagnosed with ringworm, follow your veterinarian’s treatment and cleaning instructions carefully. Wash your hands after handling the dog and avoid sharing grooming equipment between pets.

People who develop a suspicious rash should speak with a healthcare professional rather than assuming it is an ordinary irritation.

3. Salmonellosis

Salmonella bacteria can infect people and animals, including dogs.

Dogs may become exposed through contaminated food, raw animal products, contaminated environments, or contact with infected feces. Some dogs can carry and shed the bacteria without appearing obviously sick.

Humans can become infected when bacteria from contaminated feces, food, surfaces, or other sources enter the mouth.

Symptoms in people may include:

• Diarrhea
• Fever
• Stomach cramps
• Nausea
• Vomiting

Young children, older adults, and people with weakened immune systems can be more vulnerable to serious complications.

Lowering your risk

Wash your hands thoroughly after handling dog feces, cleaning pet areas, or preparing your dog’s food. Be particularly careful with raw pet food because it can carry harmful bacteria.

4. Leptospirosis

Leptospirosis is a bacterial disease caused by Leptospira organisms. It can affect both animals and humans.

Dogs can become infected through contact with contaminated water, soil, urine, or infected animals. An infected dog’s urine can potentially expose people to the bacteria.

In humans, illness can range from mild flu-like symptoms to serious disease affecting organs such as the kidneys and liver.

Possible symptoms include:

• Fever
• Headache
• Muscle aches
• Chills
• Vomiting
• Fatigue

Prevention

Vaccination can help protect dogs against important strains of Leptospira. Your veterinarian can advise whether vaccination is appropriate based on your dog’s lifestyle and local risk.

Use gloves when cleaning urine and wash your hands afterward. Avoid allowing your dog to drink from potentially contaminated standing water.

5. Campylobacteriosis

Campylobacter is a type of bacteria that can cause gastrointestinal illness.

Dogs can carry Campylobacter and may shed it in their feces. People can become infected through contact with contaminated feces or contaminated food, water, or surfaces.

Symptoms may include:

• Diarrhea
• Abdominal pain
• Fever
• Nausea
• Vomiting

Most healthy people recover, but complications can occur in some individuals.

Good hygiene makes a difference

Always wash your hands after picking up dog waste. Keep areas used for preparing human food separate from areas used for preparing pet food, and clean contaminated surfaces properly.

6. Sarcoptic Mange (Canine Scabies)

Sarcoptic mange is caused by microscopic mites that burrow into the skin.

The mites that cause canine scabies prefer dogs and generally cannot establish a long-term reproductive infestation in humans. However, people who have close contact with an affected dog can develop temporary itching and an irritated rash.

What to do if your dog has mange

Veterinary treatment is important because untreated mange can cause significant discomfort and skin damage.

You may also need to clean bedding and other frequently contacted items according to your veterinarian’s recommendations.

If people in the household develop persistent itching or a rash, they should contact a healthcare professional.

7. Lyme Disease

Lyme disease is caused by certain species of Borrelia bacteria and is transmitted primarily through the bites of infected ticks.

Dogs don’t directly give Lyme disease to people through ordinary contact. Instead, an important concern is that an infested dog can bring ticks into the household, where those ticks may later bite a person.

Protecting your household

Regularly check your dog for ticks, especially after outdoor activities.

Use veterinarian-recommended tick prevention and learn how to safely remove attached ticks.

You should also check yourself and other family members after spending time in areas where ticks are common.

Keeping your dog’s tick prevention current protects more than just the dog—it can also reduce opportunities for ticks to enter your home.

8. Giardiasis

Giardiasis is an intestinal infection caused by the microscopic parasite Giardia.

Dogs can become infected after swallowing Giardia from contaminated water, soil, food, or fecal material. They may then shed the organism in their stool.

Human infection can cause:

• Diarrhea
• Gas
• Abdominal cramps
• Nausea
• Dehydration
• Foul-smelling or greasy stools

The exact likelihood of a dog transmitting Giardia to a person depends on several factors, and not every Giardia infection in a dog represents a significant human risk.

Prevention tips

• Pick up dog feces promptly.
• Wash your hands after handling waste.
• Keep your dog’s living area clean.
• Prevent your dog from drinking from questionable water sources.
• Follow your veterinarian’s treatment instructions if your dog is diagnosed.

9. Hookworm Infections

Hookworms are parasitic worms that can infect dogs and, under certain circumstances, humans.

Some hookworm larvae can survive in contaminated soil or sand. When people walk barefoot or have exposed skin touching contaminated ground, larvae can penetrate the skin and cause cutaneous larva migrans.

The resulting condition can produce intensely itchy, winding or raised tracks beneath the skin.

Protect yourself

• Keep your dog on an appropriate parasite-control program.
• Pick up feces quickly.
• Avoid walking barefoot where animal feces may be present.
• Wash hands after gardening or handling potentially contaminated soil.
• Keep children’s play areas free from animal waste.

Regular veterinary parasite control is an important part of protecting both dogs and households.

10. Toxocariasis

Toxocara roundworms can infect dogs, particularly puppies.

Infected dogs may pass microscopic eggs in their feces. The eggs can contaminate soil or other environments and become infectious after developing in the environment.

People—especially young children—can become infected by accidentally swallowing contaminated material.

In some cases, larvae can migrate through body tissues. Rarely, they can affect the eyes or other organs.

Prevention

The simplest protective measures are often the most effective:

• Have puppies and dogs routinely checked for intestinal parasites.
• Follow your veterinarian’s deworming recommendations.
• Pick up feces promptly.
• Wash hands after outdoor play and before eating.
• Teach children not to put dirt or contaminated objects in their mouths.

11. Certain Tapeworm Infections

Dogs can carry several types of tapeworms, but the way humans become infected depends on the particular parasite.

One important example is Dipylidium caninum, which people can acquire by accidentally swallowing an infected flea. This is uncommon but can occur, particularly in children.

Other tapeworm species have different life cycles and routes of transmission.

The flea connection

Effective flea control is therefore an important part of preventing some tapeworm infections.

If you notice rice-like segments around your dog’s anus or in their stool, contact your veterinarian. Don’t attempt to diagnose the parasite solely from its appearance.

12. Brucellosis

Brucellosis is a bacterial infection caused by Brucella species.

Dogs can be affected by Brucella canis, and transmission to humans is uncommon but possible. Exposure may occur through contact with reproductive tissues, fluids, blood, urine, or other materials from an infected dog.

People may experience symptoms such as:

• Fever
• Chills
• Sweating
• Fatigue
• Headache
• Muscle or joint pain

Because transmission is uncommon but potentially significant, suspected infection in a dog should be managed with veterinary guidance and appropriate precautions.

People who may have been exposed should discuss the situation with a healthcare professional.

13. MRSA and Other Staphylococcal Infections

Methicillin-resistant Staphylococcus aureus (MRSA) is a type of staph bacteria that is resistant to several commonly used antibiotics.

Dogs and humans can sometimes carry Staphylococcus bacteria without showing signs of illness. In some circumstances, bacteria can move between people and animals.

MRSA can cause skin and soft-tissue infections and, in vulnerable individuals, more serious infections.

Reducing household transmission

Good hygiene remains important:

• Wash your hands regularly.
• Keep wounds clean and covered.
• Don’t allow your dog to lick open wounds.
• Clean frequently touched surfaces when appropriate.
• Follow medical and veterinary instructions if MRSA has been identified.

A dog shouldn’t automatically be considered the source simply because MRSA is found in a household. Transmission can occur in both directions, and determining the source may require professional investigation.

How to Protect Your Family Without Avoiding Your Dog

The possibility of zoonotic disease doesn’t mean you need to avoid cuddling your dog or enjoying normal life together.

For most households, sensible preventive care goes a long way.

Keep Vaccinations Current

Vaccines can protect dogs from important infectious diseases and, in some cases, reduce risks to people.

Rabies vaccination is particularly important in areas where rabies occurs.

Ask your veterinarian which vaccines are appropriate based on your dog’s age, lifestyle, geographic location, and exposure risks.

Stay on Top of Parasite Prevention

Fleas, ticks, intestinal worms, and other parasites can affect both animal and human health.

Your veterinarian can recommend an appropriate prevention plan based on:

• Your dog’s age
• Lifestyle
• Outdoor exposure
• Geographic area
• Other pets in the household
• Existing health conditions

Don’t assume every dog needs exactly the same parasite-control schedule.

Pick Up Dog Waste Promptly

Dog feces can contain bacteria, parasite eggs, cysts, and other organisms.

Use a bag or appropriate waste-removal method and dispose of it properly.

Afterward, wash your hands thoroughly with soap and water.

This is especially important when young children are present.

Wash Your Hands at the Right Times

Make handwashing a routine after:

• Picking up dog waste
• Cleaning accidents
• Handling a sick dog
• Gardening or handling soil
• Cleaning pet bedding
• Preparing pet food
• Handling raw pet food
• Before eating or preparing human food

You don’t need to sterilize your entire home because you own a dog. Consistent everyday hygiene is much more practical.

Feed Your Dog Safely

Raw animal products can carry pathogens such as Salmonella and Campylobacter.

If you feed your dog raw food, understand the potential risks and discuss the diet with your veterinarian. Keep pet-food preparation areas separate from areas used for human food and clean bowls and surfaces regularly.

Don’t Let Dogs Lick Open Wounds

A dog’s mouth contains many microorganisms. Although affectionate licking is common, allowing a dog to lick an open wound can introduce bacteria into damaged skin.

It’s particularly important for people with compromised immune systems to take extra care around animal saliva and wounds.

Teach Children Safe Pet Habits

Children should learn simple rules such as:

• Wash hands after playing with pets.
• Don’t touch dog feces.
• Don’t put dirty hands in their mouths.
• Don’t disturb dogs while they’re eating.
• Don’t approach unfamiliar animals.
• Tell an adult if a dog bites or scratches them.

Supervision is especially important with very young children.

When Should You Contact a Veterinarian?

Contact your veterinarian if your dog develops unusual symptoms such as:

• Persistent diarrhea
• Vomiting
• Severe itching
• Hair loss with skin lesions
• Unexplained weight loss
• Bloody stool
• Persistent coughing
• Fever or marked lethargy
• Visible worms or parasite segments
• Signs of a serious infection

Early veterinary attention can help identify and treat conditions before they become more complicated.

When Should a Person Seek Medical Advice?

If someone develops unexplained symptoms after an animal exposure, tell the healthcare professional about the contact with the dog.

Medical attention is particularly important after:

• A bite from an unfamiliar or potentially rabid animal
• A deep bite or serious wound
• Exposure to a suspected rabies-infected animal
• A persistent rash after contact with an infected animal
• Severe or persistent diarrhea
• Significant illness after handling animal waste
• Exposure to an animal known to have a zoonotic infection

Don’t wait for a disease to become severe before asking for medical advice.

Frequently Asked Questions

Can my dog make me sick?

Dogs can carry organisms that are capable of infecting humans, but this doesn’t mean that having a dog is inherently dangerous. Good veterinary care, vaccination, parasite prevention, hand hygiene, and responsible waste handling substantially reduce many avoidable risks.

Can I catch a disease simply by petting my dog?

Some infections can potentially spread through contact with an infected animal or contaminated fur, skin, or environment. However, transmission depends on the specific organism and circumstances.

Normal interaction with a healthy, well-cared-for dog is not something most people need to fear.

Are puppies more likely to carry diseases?

Puppies can be particularly susceptible to certain intestinal parasites and infections because their immune systems and exposure histories are still developing.

They also explore their surroundings with their mouths, making hygiene and veterinary preventive care especially important.

Should I stop letting my dog sleep on my bed?

Not necessarily. Many people safely share their homes and beds with dogs.

However, people who are particularly vulnerable to infections may want to discuss their individual circumstances with a healthcare professional. Dogs with active infections, parasites, or contagious skin conditions should also receive appropriate treatment before close-contact habits resume.

Can a vaccinated dog still carry infections?

Yes. Vaccines protect against specific diseases; they don’t make a dog immune to every possible infectious organism.

That’s why vaccination should be combined with parasite control, veterinary examinations, hygiene, safe food handling, and responsible pet care.

Final Thoughts

Living with a dog doesn’t have to mean worrying constantly about disease. Zoonotic infections are real, but many risks can be reduced through straightforward preventive habits.

Keep your dog’s vaccinations and parasite prevention up to date, clean up waste promptly, wash your hands regularly, handle pet food safely, and seek veterinary care when your dog becomes sick.

At the same time, remember that dogs provide enormous companionship and enrichment to their families. The goal of zoonotic-disease awareness isn’t to create fear—it is to help pet owners make informed choices that protect both their animals and the people who love them.

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