There’s something magical about the bond between humans and animals. That wagging tail when you walk through the door. The warm purr on your lap after a long day. The wet nose nudging your hand for attention. For millions of us, pets aren’t just animals—they’re family.
But here’s a truth we don’t like to think about: our beloved companions can sometimes share more than love. They can carry diseases that pass to humans—what scientists call zoonotic diseases or zoonoses.
Before you panic and start looking at your dog suspiciously, know this: the risk is real but manageable. According to the Centers for Disease Control and Prevention (CDC), more than 6 out of every 10 known infectious diseases in people can be spread from animals . That sounds scary, but the vast majority of pet owners never get sick from their animals. With basic precautions, you can protect yourself and your family while still enjoying all the benefits of pet companionship.
Let’s talk about the most common diseases pets can transmit, the real dangers if ignored, and exactly how to keep everyone safe.
Why This Matters: The Bigger Picture
Zoonotic diseases aren’t new. Throughout history, illnesses like rabies and plague have shaped human civilization. But our relationship with animals has changed. We live closer to them than ever before—they sleep in our beds, lick our faces, and share our homes.
The CDC estimates that hundreds of thousands of Americans get sick from zoonotic diseases each year, though many cases are mild and unreported . The very young, the elderly, pregnant women, and people with weakened immune systems face the highest risks.
Understanding these risks isn’t about fear. It’s about respect—for both our animals and ourselves. As one veterinarian put it: “A healthy pet means a healthy owner.”
Common Diseases We Can Get from Pets
1. Ringworm (Dermatophytosis)
What it is: Despite the name, ringworm isn’t a worm at all. It’s a fungal infection that affects skin, hair, and nails. It gets its name from the ring-shaped rash it creates.
How you get it: Direct contact with an infected animal. The fungus lives in skin cells and hair, which can shed into your environment. You can also catch it from contaminated bedding, brushes, or furniture. Cats—especially kittens—are common carriers, but dogs, rabbits, and other pets can transmit it too .
Symptoms in humans: A red, itchy, ring-shaped rash with clearer skin in the middle. It can appear anywhere on your body. On the scalp, it may cause hair loss. The rash can take 10-14 days to appear after exposure .
The danger if ignored: Ringworm rarely causes serious health problems, but it’s highly contagious and stubborn. Without treatment, it can spread across your body and to other people in your household. Secondary bacterial infections can occur if you scratch open the lesions.
Prevention: Wash your hands after handling pets, especially new animals. Keep your pet’s bedding clean. If your pet has bald patches or suspicious skin lesions, see a veterinarian. And yes—ringworm is treatable in both humans and animals with antifungal medications.
2. Toxoplasmosis
What it is: A parasitic infection caused by Toxoplasma gondii, one of the most common parasites in the world. The CDC estimates that more than 40 million Americans may carry it, though most never have symptoms .
How you get it: Cats are the primary host. They become infected by eating infected rodents, birds, or contaminated raw meat. The parasite then sheds microscopic eggs (oocysts) in the cat’s feces. Humans get infected by accidentally ingesting these eggs—often through cleaning litter boxes and not washing hands thoroughly, or through contaminated soil in gardening .
Symptoms in humans: Most healthy people never know they have it. Some experience mild flu-like symptoms: swollen lymph glands, muscle aches, and fatigue lasting a few weeks. The real danger comes in specific situations.
The danger if ignored: For pregnant women, toxoplasmosis is serious. It can cause miscarriage, stillbirth, or severe birth defects affecting the baby’s brain and eyes . For people with weakened immune systems (HIV/AIDS, chemotherapy patients), it can cause severe neurological issues.
Prevention: If you’re pregnant or immunocompromised, avoid cleaning litter boxes if possible. If you must, wear gloves and wash thoroughly. Clean litter boxes daily—the parasite takes 1-5 days to become infectious after being shed. Keep cats indoors to prevent them from hunting. Wear gloves for gardening. Cook meat thoroughly.
Important note: You’re more likely to get toxoplasmosis from undercooked meat or contaminated soil than from your cat. But precautions matter.
3. Rabies
What it is: A viral disease that attacks the central nervous system. It’s almost always fatal once symptoms appear.
How you get it: Through the saliva of an infected animal—usually a bite. In the United States, rabies is most common in wild animals like raccoons, skunks, bats, and foxes. However, unvaccinated pets can catch it from wildlife and pass it to humans .
Symptoms in humans: Early symptoms are flu-like: fever, headache, weakness. As it progresses, it causes anxiety, confusion, agitation, hallucinations, and hydrophobia (fear of water). Once these symptoms appear, death is nearly certain .
The danger if ignored: Rabies is one of the most dangerous zoonotic diseases because it’s almost always fatal. Worldwide, it kills about 59,000 people annually, mostly in Asia and Africa where vaccination isn’t widespread .
Prevention: Vaccinate your pets. Keep them away from wildlife. If you’re bitten by any animal—especially a wild one or an unknown pet—wash the wound thoroughly with soap and water for 15 minutes and seek medical attention immediately. Post-exposure prophylaxis (a series of shots) is highly effective if given before symptoms appear.
4. Cat Scratch Disease (Bartonellosis)
What it is: A bacterial infection caused by Bartonella henselae. About 40% of cats carry it at some point in their lives, especially kittens .
How you get it: Through a scratch or bite from an infected cat, or when a cat licks an open wound. Fleas spread the bacteria among cats, so flea control matters.
Symptoms in humans: A small bump or blister at the scratch site, followed by swollen, tender lymph nodes near the area (usually armpit, neck, or groin). Some people develop fever, fatigue, and headache. Symptoms typically appear 3-14 days after exposure .
The danger if ignored: In healthy people, cat scratch disease usually resolves on its own or with antibiotics. But in rare cases, it can affect the brain, eyes, or heart valves—especially in immunocompromised individuals .
Prevention: Avoid rough play with cats that could lead to scratches. Wash any scratches or bites immediately with soap and running water. Keep your cat’s nails trimmed. Control fleas. If you develop swollen lymph nodes after a cat scratch, see a doctor.
5. Leptospirosis
What it is: A bacterial disease that affects both animals and humans. It’s found worldwide, especially in warm climates and after heavy rainfall.
How you get it: The bacteria are shed in the urine of infected animals—including dogs, rats, and wildlife. Humans get infected through contact with contaminated water, soil, or food. The bacteria can enter through cuts or mucous membranes (eyes, nose, mouth) .
Symptoms in humans: Ranges from mild (fever, headache, muscle aches) to severe. Some people develop Weil’s disease, a serious form causing jaundice, kidney failure, and bleeding .
The danger if ignored: Leptospirosis can cause kidney damage, liver failure, and meningitis. Without treatment, recovery can take months, and some cases are fatal.
Prevention: Vaccinate dogs against leptospirosis (it’s not part of the standard core vaccine, so ask your vet). Avoid standing water after floods. Control rodents. Wear protective footwear if you’re in potentially contaminated environments. Wash hands after handling animals.
6. Salmonellosis
What it is: A bacterial infection caused by Salmonella. Most people associate it with food poisoning, but pets can transmit it too.
How you get it: Reptiles (turtles, lizards, snakes) and amphibians (frogs) are common carriers—up to 90% of reptiles carry Salmonella without showing symptoms . Hedgehogs, chicks, ducklings, and even dogs and cats can carry it. You get infected by touching the animal or its environment and then touching your mouth .
Symptoms in humans: Diarrhea, fever, stomach cramps starting 6 hours to 6 days after infection. Lasts 4-7 days.
The danger if ignored: In healthy people, it’s unpleasant but usually resolves without treatment. But in young children, elderly, and immunocompromised individuals, it can cause severe dehydration and spread to the bloodstream, requiring hospitalization .
Prevention: Wash hands thoroughly after handling reptiles, amphibians, or any animal. Don’t let these animals roam freely in the kitchen or areas where food is prepared. The CDC recommends that children under 5 and people with weakened immune systems avoid contact with reptiles and amphibians entirely .
7. Roundworm and Hookworm
What they are: Intestinal parasites that can infect dogs and cats—especially puppies and kittens.
How you get it: Eggs are shed in the animal’s feces and contaminate soil. Humans get infected by accidentally ingesting the eggs (from unwashed hands after gardening, playing in contaminated soil, or children eating dirt) .
Symptoms in humans: Roundworm larvae can migrate through organs, causing a condition called visceral larva migrans. Symptoms include fever, coughing, enlarged liver, and sometimes eye involvement leading to vision loss . Hookworm larvae can cause cutaneous larva migrans—a creeping, itchy skin rash .
The danger if ignored: In rare cases, roundworm can affect the eyes, causing permanent vision damage. Hookworm rash is intensely itchy and can become infected from scratching.
Prevention: Deworm puppies and kittens as recommended by your vet. Clean up pet feces promptly—especially from yards and sandboxes where children play. Wash hands after gardening or playing outside. Cover sandboxes when not in use.
8. Psittacosis (Parrot Fever)
What it is: A bacterial infection caused by Chlamydia psittaci. It primarily affects birds—parrots, cockatiels, parakeets, pigeons, and poultry.
How you get it: Inhaling dust from dried bird droppings, respiratory secretions, or feather dust. Even brief exposure can cause infection .
Symptoms in humans: Fever, chills, headache, muscle aches, and dry cough. Can range from mild to severe pneumonia.
The danger if ignored: Without treatment, psittacosis can cause pneumonia, encephalitis, and organ damage. It’s especially serious in older adults.
Prevention: Buy birds only from reputable sources. Keep bird cages clean to prevent droppings from drying and becoming airborne. If your bird shows signs of illness (fluffed feathers, discharge, lethargy), see a vet. People at high risk should use masks when cleaning cages.
Who’s Most at Risk?
While anyone can get sick from pet-borne diseases, certain groups face higher risks:
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Young children (under 5) – They’re more likely to put things in their mouths and have developing immune systems
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Pregnant women – Some infections like toxoplasmosis can harm the fetus
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Elderly adults – Aging immune systems respond less effectively
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People with weakened immune systems – Including those with HIV/AIDS, cancer patients undergoing chemotherapy, organ transplant recipients, and people taking immunosuppressive medications
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People with chronic illnesses – Diabetes, liver disease, and other conditions can increase risk
If you fall into any of these categories, you don’t need to rehome your pet. You just need to be extra careful about hygiene and veterinary care.
Simple Steps to Protect Yourself and Your Family
Here’s the good news: preventing zoonotic diseases isn’t complicated. These basic practices make a huge difference:
1. Wash Your Hands
This is the single most important step. Wash your hands with soap and running water:
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After handling pets or their food
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After cleaning cages, litter boxes, or aquariums
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After picking up feces
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After gardening or接触 soil where animals might have been
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Before eating or preparing food
Hand sanitizer works in a pinch, but soap and water are better for removing certain germs.
2. Keep Up with Veterinary Care
Regular vet visits aren’t just for your pet’s health—they protect you too.
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Keep vaccinations current (especially rabies)
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Use year-round parasite prevention (fleas, ticks, worms)
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Have new pets examined promptly
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Discuss zoonotic risks with your vet
3. Practice Good Pet Hygiene
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Clean litter boxes daily (remember, toxoplasma takes days to become infectious)
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Scoop dog waste from yards promptly
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Keep pet areas clean and disinfected
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Wash pet bedding regularly
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Control fleas and ticks on all pets
4. Be Smart About Food
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Don’t feed pets raw meat—it can infect them and you
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Store pet food separately from human food
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Wash pet food and water bowls regularly
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Keep pets out of food preparation areas
5. Protect High-Risk Family Members
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If you’re pregnant, avoid cleaning litter boxes
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Teach children to wash hands after pet contact
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Supervise young children around animals
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Keep pets’ nails trimmed to reduce scratch risks
6. Handle Wildlife with Caution
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Don’t approach or feed wild animals
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Keep pets away from wildlife
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If you find an injured wild animal, call a rehabilitator—don’t handle it yourself
7. Know the Signs
Watch for illness in your pets:
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Skin lesions or hair loss (ringworm)
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Diarrhea or vomiting
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Lethargy or behavior changes
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Respiratory symptoms
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If your pet seems sick, see a vet and mention zoonotic concerns
Watch for illness in yourself after pet contact:
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Unexplained fever, rash, or flu-like symptoms
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Swollen lymph nodes
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Persistent diarrhea
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If you’re concerned, tell your doctor about your pet exposure
The Bottom Line: Love and Caution Can Coexist
Our pets give us so much—companionship, joy, comfort, and unconditional love. The risk of getting sick from them is real, but it’s also manageable. With basic hygiene, regular veterinary care, and common sense, you can protect yourself and your family while still enjoying all the benefits of the human-animal bond.
The goal isn’t fear. It’s respect. Respect for the fact that we share our homes with other species, and with that privilege comes responsibility—to them and to ourselves.
As one public health expert put it: “A healthy pet in a clean environment, cared for by someone with good hygiene practices, poses very little risk to its human family.”
So go ahead—let your dog curl up at your feet. Let your cat purr on your chest. But wash your hands afterward, keep up with vet visits, and pay attention when something seems off. That’s not paranoia. That’s love, expressed through care.