Your beloved pet might be cuddly, but could they also be a tiny, fluffy biohazard?
It’s a thought no one wants to entertain, but the truth is, animals can carry diseases that jump straight from them to you. Some are mild and annoying, others? Downright terrifying. And the scariest part? You might not even see them coming.
From bacteria lurking in saliva to parasites hiding in fur, these illnesses can sneak into your life in the most unexpected ways. A scratch, a lick, even simple cleaning routines can expose you to something sinister.
Before you panic and start wearing hazmat suits around your pet, don’t worry—we’re diving into the details so you can stay informed (and safe). Here are 19 diseases vets warn you don’t want to mess with.
Rabies

Rabies is a viral disease that affects the central nervous system. It is primarily transmitted through the bite of an infected animal, most commonly affecting dogs. Symptoms may include fever, headache, and general weakness, followed by neurological symptoms such as confusion and hallucinations.
Once symptoms appear, rabies is almost always fatal, which makes immediate medical attention crucial after exposure. Vaccination for pets and avoiding contact with wild animals are effective preventive measures.
Pet owners should ensure their animals are vaccinated and report any unusual behavior or bites to healthcare providers immediately.
Cat Scratch Fever

Cat Scratch Fever is caused by the Bartonella henselae bacteria. Transmitted through scratches or bites from cats, this disease can lead to swollen lymph nodes, fever, fatigue, and headache.
Most cases are mild and resolve without treatment, but in some instances, antibiotics may be required, particularly if symptoms persist or worsen. To prevent this disease, avoid rough play with cats and ensure your pet’s claws are trimmed.
Washing scratches and bites promptly can also reduce the risk of infection, making it a simple yet effective preventative measure for cat owners.
Toxoplasmosis

Toxoplasmosis is a parasitic infection often spread through contact with cat feces, particularly when cleaning litter boxes. Most healthy individuals experience mild flu-like symptoms or none at all.
However, pregnant women and immunocompromised individuals are at higher risk of severe complications, including birth defects. It’s advised that pregnant women avoid litter box duties if possible, or use gloves and wash hands thoroughly afterward.
Cooking meat thoroughly and washing fruits and vegetables also help prevent this infection, ensuring the health of both pets and their owners.
Ringworm

Ringworm is a fungal infection that is highly contagious and can be transmitted from pets to humans through direct contact. It appears as a circular, red, itchy rash on the skin.
Both animals and humans can carry and spread the spores, which survive on skin and surfaces. Treatment typically involves antifungal medications, which may be prescribed for both the human and animal carriers.
Keeping pets clean, avoiding sharing personal items, and ensuring good hygiene can prevent the spread of ringworm, safeguarding both families and their furry companions.
Psittacosis

Psittacosis, or parrot fever, is a bacterial infection transmitted through inhaling dust from dried bird droppings. It often affects people who handle birds, such as parrots and cockatiels.
Symptoms resemble pneumonia and include fever, chills, headache, and muscle aches, sometimes leading to severe respiratory complications. Antibiotics effectively treat Psittacosis if diagnosed promptly.
Regular cleaning of bird cages, with proper precautions like masks and gloves, helps in prevention. Bird owners should be vigilant about their pets’ health and seek veterinary care if their bird exhibits signs of illness.
Salmonella

Salmonella is a bacterial infection commonly associated with reptiles, such as turtles, snakes, and lizards. It can spread to humans through contact with these animals or contaminated surfaces.
Symptoms in humans include diarrhea, fever, and abdominal cramps. While most people recover without treatment, severe cases may require medical attention, especially in young children and the elderly.
Preventive measures include thorough hand washing after handling pets or cleaning habitats, and ensuring that reptiles are kept out of areas where food is prepared or consumed, reducing cross-contamination risks.
Leptospirosis

Leptospirosis is a bacterial disease that affects both humans and animals, commonly spread through contact with water contaminated by infected animal urine. Dogs are often carriers, especially in rural or outdoor settings.
Human symptoms range from mild flu-like signs to severe illness, including liver or kidney damage. Early diagnosis and antibiotic treatment are crucial for recovery.
Pet owners can reduce risk by vaccinating their dogs, avoiding stagnant water, and using protective footwear or clothing during outdoor activities to minimize exposure to potential sources of infection.
Campylobacteriosis

Campylobacteriosis is an infection caused by Campylobacter bacteria, often spread through contact with infected animals, particularly puppies and kittens, or by consuming contaminated food or water.
Symptoms include diarrhea, cramping, abdominal pain, and fever, usually lasting about one week. Most people recover without specific treatment, although hydration is important.
To prevent infection, practice good hygiene, such as washing hands after pet handling and ensuring pets are well-cared-for and clean. Avoiding raw or undercooked poultry and other animal products also reduces the risk of this bacterial infection.
Giardiasis

Giardiasis is a diarrheal disease caused by the parasite Giardia, found in contaminated water or through direct contact with infected animals or humans. Dogs and cats are common carriers.
Infected individuals may experience diarrhea, gas, and stomach cramps. The infection often clears up on its own, but persistent cases might require medication.
Preventive measures include boiling or filtering water in areas where Giardia is common, practicing good hygiene, and ensuring pets are not drinking from contaminated sources, safeguarding health for both human and animal companions.
Brucellosis

Brucellosis is a bacterial infection transmitted from animals to humans through direct contact with infected animals or by consuming unpasteurized dairy products. It affects various livestock and can occasionally be found in dogs.
Humans may experience fever, joint pain, and fatigue. Chronic cases can lead to serious complications if untreated. Antibiotics are effective if given promptly.
Preventive strategies include vaccinating livestock, using protective gear when handling animals, and avoiding unpasteurized dairy products. Awareness of this disease’s sources and transmission is crucial for those in contact with potential carriers.
Hookworms

Hookworms are parasitic worms that can be transmitted from dogs and cats to humans. They typically enter the body through the skin, often when someone walks barefoot on contaminated soil.
Infections can cause itchy skin rashes, abdominal discomfort, and anemia. Severe cases may require medication to eradicate the parasites.
Preventing hookworm involves regular deworming of pets, maintaining clean living environments, and encouraging children to wear shoes outdoors. These simple precautions significantly reduce the risk of infection, keeping both pets and their owners healthy and active.
Roundworms

Roundworms are one of the most common parasites found in dogs and cats, and they can be transmitted to humans, particularly children. In humans, they can cause a condition known as toxocariasis.
Symptoms in humans may range from mild to severe, including fever, cough, or even damage to organs. Regular deworming of pets and proper hygiene practices, like washing hands after handling soil or animals, can prevent transmission.
Maintaining a clean environment and monitoring pets’ health are key strategies to prevent roundworm infections and ensure the safety of families.
Tapeworms

Tapeworms are flat, segmented worms that can infect both animals and humans. Pets can acquire them through fleas, which act as intermediate hosts, or by eating infected animals.
In humans, symptoms are often mild but can include nausea, abdominal pain, and fatigue. Treatment with anthelmintic medications is effective in removing the parasites.
Regular flea control and maintaining good hygiene are essential in preventing tapeworm infections. Ensuring pets receive proper veterinary care and monitoring their environments help protect both pets and their owners from these parasites.
Cryptosporidiosis

Cryptosporidiosis is a diarrheal disease caused by Cryptosporidium parasites, commonly spread through contaminated water or direct contact with infected animals. Both humans and animals can host the parasite.
Symptoms include diarrhea, stomach cramps, and dehydration, lasting up to two weeks. Immunocompromised individuals may experience more severe illness.
Preventive measures include practicing good hygiene, such as washing hands thoroughly after contact with animals or gardening, and ensuring access to clean, safe drinking water. By maintaining these practices, both pet owners and their furry friends can enjoy a healthy lifestyle.
Toxocariasis

Toxocariasis is an infection caused by the larvae of roundworms, primarily Toxocara canis and Toxocara cati. It is transmitted through contact with contaminated soil or sand, often where pets defecate.
In humans, especially children, it can result in symptoms like fever, coughing, and abdominal pain. In severe cases, it can lead to organ damage or vision loss.
Preventive strategies include regular deworming of pets, cleaning up pet waste, and ensuring children wash their hands after playing outdoors, reducing the risk of infection and maintaining family health.
Scabies

Scabies is a skin condition caused by mites that burrow into the skin, leading to intense itching and a pimple-like rash. While typically associated with human-to-human transmission, pets can act as carriers.
Diagnosis usually involves skin examination, and treatment includes prescribed medicated creams. It’s important to treat all close contacts and thoroughly clean living spaces to prevent re-infestation.
Maintaining pets’ health with regular veterinary check-ups and treating infestations promptly helps prevent scabies, ensuring a comfortable and itch-free environment for everyone involved.
Lyme Disease

Lyme disease is caused by the bacterium Borrelia burgdorferi, transmitted to humans through tick bites. Pets, especially dogs, can carry ticks into homes, increasing the risk for their owners.
Symptoms include fever, headache, fatigue, and a characteristic skin rash. If left untreated, infection can spread to joints, the heart, and the nervous system.
Using tick prevention methods for pets, like topical treatments and tick collars, along with checking for ticks after outdoor activities, can significantly reduce the risk of Lyme disease for both pets and their humans.
MRSA (Methicillin-resistant Staphylococcus aureus)

MRSA is a type of staph infection that is resistant to many antibiotics, making treatment challenging. Pets can carry MRSA on their skin, potentially transmitting it to humans.
In humans, MRSA causes skin infections that appear as red, swollen, painful bumps, and can lead to more severe health issues if not properly treated.
Preventative measures include good hygiene practices, such as washing hands after pet contact, and ensuring that any cuts or scrapes are clean and covered. Regular veterinary check-ups can help manage and prevent MRSA in pets, protecting both human and animal health.
Plague

Plague is a serious bacterial infection transmitted primarily by fleas, which can be carried by rodents and sometimes pets like cats and dogs. Although rare, human cases still occur.
Symptoms include fever, chills, weakness, and swollen lymph nodes. Immediate medical treatment with antibiotics is crucial for recovery.
Prevention involves controlling flea populations on pets and avoiding exposure to wild rodents. Maintaining clean living spaces and using flea prevention methods for animals are key strategies to minimize the risk of plague, safeguarding the health of both pets and their owners.