# Is Jaundice in Dogs Contagious to Other Pets? Jaundice in dogs contagious is a common worry for owners who see yellow gums, eyes, or skin on their pet. The short answer is no. Jaundice is a sign of an underlying problem, not an infection that passes from dog to dog. However, a few of the diseases that cause jaundice can spread to other pets and sometimes to people, so the cause matters as much as the color. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Jaundice (also called icterus) is a buildup of bilirubin pigment in the blood and tissues, which turns the gums, sclera, and skin yellow [1]. It is a sign, not a disease. - The yellow color itself cannot be transmitted to another pet or to you. - Some causes are infectious. Leptospirosis is a bacterial infection that can spread to other dogs and to people through urine [2]. - Other causes, such as immune-mediated hemolytic anemia, gallbladder disease, and congenital bile duct problems, do not spread between animals. - If your dog has yellow gums or eyes, treat it as urgent and call your veterinarian the same day. ## What Jaundice Looks Like and What Is Normal Jaundice shows up as a yellow tint in the gums, the whites of the eyes, the inside of the eyelids, the skin, and sometimes the urine [1]. In mild cases you may only notice it in bright light. In severe cases the whole dog looks yellow. Normal gums are pink, not yellow or pale. Normal urine is yellow but clear, not dark like tea or syrup. If your dog's urine looks brown or orange, that is a reason to call your vet. Jaundice is different from other color changes. Pale gums usually point to anemia or poor circulation. Yellow gums point to bilirubin buildup. Your veterinarian can tell the difference quickly with an exam and bloodwork. Bilirubin comes from the normal breakdown of red blood cells. The liver processes it and sends it out through bile. Jaundice happens when too much bilirubin is made, when the liver cannot process it, or when bile cannot flow out of the liver and gallbladder [1]. That is why jaundice can come from blood problems, liver problems, or bile duct problems. ## Main Causes of Jaundice in Dogs The list of possible causes is long. Your veterinarian will sort them into three groups: problems before the liver (red blood cell destruction), problems inside the liver (liver cell dysfunction), and problems after the liver (bile flow blockage) [1]. | Cause | Typical clues | How urgent | |---|---|---| | Immune-mediated hemolytic anemia (IMHA) | Pale gums that turn yellow, weakness, fast breathing, dark urine | Emergency | | Leptospirosis (bacterial infection) | Fever, vomiting, muscle soreness, sudden kidney or liver problems, exposure to wildlife urine or standing water | Emergency, and a zoonotic risk to people and other pets [2] | | Biliary tract infection (bacterial) | Vomiting, not eating, belly pain, fever, high liver enzymes [3] | Urgent, same day | | Gallbladder or bile duct obstruction (stones, sludge, stricture) | Vomiting, weight loss, lethargy, yellow eyes [4] | Emergency if bile leaks into the abdomen [1] | | Biliary protozoal infection (Toxoplasma, Neospora, Hammondia and related organisms) | Mixed liver disease, inflammation of the biliary tract [5] | Urgent, needs specific testing | | Congenital bile duct malformation (Caroli-like disease) | Young dog, jaundice, weight loss, lethargy, stones in the bile ducts [4] | Urgent, often needs surgery [4] | | Toxin or drug injury to the liver | Recent exposure to a toxin or medication, vomiting, appetite loss | Emergency | | Cancer of the liver or bile ducts | Weight loss, appetite loss, slow onset of yellow color | Urgent | Some of these causes are infectious, and some are not. Leptospirosis is the one most owners ask about because it can pass from dogs to people and to other dogs through urine [2]. Biliary bacterial infections are increasingly recognized in dogs and are treated with antibiotics chosen from a bile culture [3]. Biliary protozoal infections are uncommon and host-specific, which means they generally do not jump easily between species [5]. If your dog has other signs such as weight loss, vomiting, or changes in appetite, our guide to [liver disease symptoms in dogs](/knowledge/veterinary-medicine/symptom-guides/liver-disease-symptoms-in-dogs) can help you describe what you are seeing when you call your vet. ## Is Dog Jaundice Contagious? What Actually Spreads The yellow color does not spread. The infection behind some cases can. Leptospirosis is a zoonotic bacterial infection that can cause acute liver injury and jaundice, and it can mimic other forms of hepatitis [2]. People catch it through contact with infected urine or contaminated water and soil. Dogs catch it the same way. If your dog has leptospirosis, other dogs in the home and the people handling them are at risk [2]. Biliary bacterial infections can involve organisms that are common in the environment. They are treated as individual infections, and routine hygiene is usually enough to protect other pets. Biliary protozoal infections such as Hammondia, Toxoplasma, and Neospora are uncommon and host-specific [5]. That means they tend to stay within their usual host species. A dog with one of these infections is not likely to pass it to a cat or to you, but your veterinarian may still recommend testing other animals if there is a shared exposure. Non-infectious causes cannot spread at all. IMHA, gallbladder stones, congenital bile duct malformations, toxin injury, and cancer are not contagious. If you are worried about other infections that can pass between pets, our articles on [can worms cause infection in dogs](/knowledge/veterinary-medicine/parasitic-diseases/can-worms-cause-infection-in-dogs) and [does my dog have worms symptoms](/knowledge/veterinary-medicine/parasitic-diseases/does-my-dog-have-worms-symptoms) cover common household risks. Viral infections such as canine herpes are also species-specific, which you can read about in [can a dog have herpes](/knowledge/veterinary-medicine/clinical-methods/can-a-dog-have-herpes). ## Red Flags That Make It an Emergency Call an emergency clinic right away if you see any of these: - Yellow gums, yellow eyes, or yellow skin that appeared suddenly or is getting worse. - A swollen, painful belly. Bile leaking into the abdomen is a surgical emergency, and a bilirubin level in the abdominal fluid more than ten times higher than in the blood confirms it [1]. - Collapse, weakness, or trouble breathing. Severe anemia from IMHA can be life threatening. - Seizures, stupor, or trouble walking. High bilirubin levels have been linked to neurologic signs in dogs with immune-mediated hemolytic anemia [6]. - Very dark urine, black stool, or vomiting blood. - Not eating for more than a day, or repeated vomiting. - Known or suspected exposure to leptospirosis, such as contact with wildlife urine, flooded areas, or standing water. Do not wait to see if the yellow color fades on its own. Jaundice almost always means something serious is happening inside the body. ## Safe Things You Can Do at Home While You Wait Your main job at home is to keep your dog comfortable and protect the people and pets around you. - Keep your dog away from other pets if leptospirosis is possible or confirmed. Use a separate water bowl and clean up urine promptly. - Wear gloves when cleaning urine, vomit, or diarrhea. Wash your hands with soap and water afterward. - Do not let your dog lick your face or any open cuts while you are waiting for test results. - Offer water often. Small amounts frequently are better than a large bowl if your dog is vomiting. - Do not give any human medication. Many pain relievers and fever reducers are toxic to dogs and can worsen liver injury. - Do not force food. If your dog will not eat, that is information your veterinarian needs. - Take a photo of the yellow gums or eyes in natural light. Color changes can be hard to describe over the phone. - Write down when the yellow color started, what your dog has eaten, any possible toxin exposure, and any travel or outdoor activity. If you have a possible poisoning, call your veterinarian or a pet poison control hotline right away. Do not wait for an appointment. ## What Your Veterinarian Will Check and Test Your veterinarian will start with a full physical exam, including the color of the gums, sclera, and skin [1]. They will feel the belly for pain, swelling, or an enlarged liver or gallbladder. Bloodwork usually includes a complete blood count, a chemistry panel, and a bilirubin level. High liver enzymes and high bilirubin point toward liver or bile duct disease [3]. A low red blood cell count with yellow gums points toward hemolytic anemia [6]. Imaging is a key step. Abdominal ultrasound helps identify biliary tract infection, gallbladder disease, bile duct obstruction, and bile leakage [3]. Ultrasound also lets your veterinarian collect a bile sample with a needle for cytology and culture, which guides the right antibiotic choice [3]. In some cases, computed tomography gives a clearer picture of the bile ducts and any stones [4]. Specific testing depends on what your vet suspects. Leptospirosis is diagnosed with blood tests and clinical criteria [2]. Biliary protozoal infections may need PCR testing and genetic sequencing of a bile sample to identify the exact organism [5]. Treatment is set by your veterinarian based on the cause, your dog's weight, and your dog's overall health. Some cases need surgery, especially if bile is leaking into the abdomen or a stone is blocking the bile duct [1][4]. Others need antibiotics, immune-suppressing medication, or supportive care with fluids and nutrition. ## Prevention and Monitoring You cannot prevent every cause of jaundice, but you can lower the risk of the contagious ones. - Vaccinate against leptospirosis if your dog is at risk. Talk with your veterinarian about whether the vaccine fits your dog's lifestyle [2]. - Keep your dog away from standing water, flooded areas, and wildlife urine, especially in areas where leptospirosis is common [2]. - Control rodents and other wildlife around your home. - Store medications, human foods, and household chemicals out of reach. - Keep routine wellness visits so liver values are checked before signs appear. - Watch for early signs such as appetite loss, vomiting, and lethargy. These often come before yellow color appears [3]. - If your dog has a chronic liver or gallbladder condition, follow your veterinarian's monitoring schedule and recheck plan. If your dog has had jaundice before, keep a simple log of appetite, energy, urine color, and gum color. Bring it to every visit. Patterns help your veterinarian spot a relapse early. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is causing your dog's jaundice. Only a veterinarian can do that after an exam and testing. Individual cases need a veterinarian, and the timing of care matters. Call your veterinarian the same day if you notice yellow gums, yellow eyes, or yellow skin, even if your dog seems otherwise fine. Call right away, or go to an emergency clinic, if your dog is weak, collapsing, breathing hard, having seizures, has a painful or swollen belly, or is vomiting repeatedly. Call your veterinarian within a day or two if your dog has a known liver condition and you see appetite loss, vomiting, or a change in urine color. If leptospirosis is possible, tell your veterinarian about any contact with wildlife, standing water, or other dogs that have been sick [2]. This helps them test the right things and protect your household. ## Frequently Asked Questions ### Can my other dog catch jaundice from my dog? No, the yellow color itself is not contagious. However, if the cause is leptospirosis, other dogs in the home can become infected through contact with urine or contaminated water [2]. Keep sick dogs separated and practice good hygiene until your veterinarian confirms the cause. ### Can I catch jaundice from my dog? You cannot catch the yellow color. You can catch some of the infections that cause it, especially leptospirosis, which is zoonotic and can pass from dogs to people [2]. Wear gloves when cleaning up urine or vomit and wash your hands well afterward. ### Is jaundice in dogs always a sign of liver failure? No. Jaundice can come from red blood cell destruction, liver cell problems, or bile flow blockage [1]. Some causes are treatable, and some are emergencies. Bloodwork and ultrasound help your veterinarian find the source. ### How fast does jaundice progress in dogs? It varies widely by cause. Some dogs develop yellow gums over a day or two with severe anemia, while others show a slow yellowing over weeks with a bile duct blockage [4]. Any new yellow color deserves a same-day call to your veterinarian. ### Can worms cause jaundice in dogs? Worms are not a common direct cause of jaundice, but heavy parasite burdens can cause anemia and other health problems. Biliary protozoal infections are a different group of organisms and are uncommon in dogs [5]. If you are concerned about parasites, ask your veterinarian about a fecal test and a deworming plan. ## Related Articles - [Liver Disease Symptoms In Dogs](/knowledge/veterinary-medicine/symptom-guides/liver-disease-symptoms-in-dogs) - [Can A Dog Have Herpes](/knowledge/veterinary-medicine/clinical-methods/can-a-dog-have-herpes) - [Can Worms Cause Infection In Dogs](/knowledge/veterinary-medicine/parasitic-diseases/can-worms-cause-infection-in-dogs) - [Can Dog Get Herpes](/knowledge/veterinary-medicine/clinical-methods/can-dog-get-herpes) - [Does My Dog Have Worms Symptoms](/knowledge/veterinary-medicine/parasitic-diseases/does-my-dog-have-worms-symptoms) - [How To Know If Dogs Got Worms](/knowledge/veterinary-medicine/parasitic-diseases/how-to-know-if-dogs-got-worms) - [Can You Treat Jaundice in Dogs at Home?](/knowledge/veterinary-medicine/symptom-guides/jaundice-in-dogs-home-treatment) - [Jaundice in Dogs: Causes and Symptoms](/knowledge/veterinary-medicine/symptom-guides/jaundice-in-dogs-causes-symptoms) - [Is Jaundice in Cats Contagious? What Owners Should Know](/knowledge/veterinary-medicine/symptom-guides/jaundice-cats-contagious) ## References 1. [Jaundice in Small Animals - Digestive System](https://www.merckvetmanual.com/digestive-system/pathophysiology-of-hepatic-disease-in-small-animals/jaundice-in-small-animals). Merck Veterinary Manual. 2. [Co-infection With Leptospirosis During Acute Hepatitis B Serologic Recovery: A Case Report](https://pubmed.ncbi.nlm.nih.gov/42761991/). Cureus, 2026. 3. [Biliary Tract Infections in Dogs](https://pubmed.ncbi.nlm.nih.gov/40360338/). The Veterinary clinics of North America. Small animal practice, 2025. 4. [Imaging diagnosis of Caroli-like disease with concurrent extrahepatic biliary obstruction in a young small-breed dog: case report](https://pubmed.ncbi.nlm.nih.gov/42290769/). Frontiers in veterinary science, 2026. 5. [Canine cholecystitis in the presence of Hammondia spp. infection](https://pubmed.ncbi.nlm.nih.gov/42736002/). Veterinary parasitology, regional studies and reports, 2026. 6. [Hyperbilirubinemia and neurologic signs in dogs with non-associative immune-mediated hemolytic anemia: 81 cases (2015-2024)](https://pubmed.ncbi.nlm.nih.gov/41742491/). Journal of veterinary internal medicine, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)