Rabies in dogs – symptoms and suspected exposure

Overview

A serious viral disease

Rabies causes rapidly progressive inflammation of the brain and spinal cord. It is caused by lyssaviruses, of which the classical rabies virus is the best known. All mammals can be infected, so other pets and people can be exposed as well as dogs.

One surveillance account from northern Europe describes a country officially recognised as rabies-free since 1991. Its last locally acquired case of classical rabies was recorded in 1989. Rabies was diagnosed there in a puppy imported from India in 2007.

A surveillance report from northern Europe records 9 dogs tested for rabies in 2025. Of these, 3 had been imported illegally. None of the dogs tested had rabies. Bat lyssaviruses were recorded in that country in 2009, 2016 and 2017. These other bat lyssaviruses are distinguished from the classical rabies virus covered by that country's rabies-free status.

Causes

Saliva carries the virus into tissue

The most common route is a bite introducing an infected animal's saliva into another animal's tissues. Saliva can also transmit infection if it enters a fresh wound or contacts a mucous membrane. Mucous membranes include the surfaces of the eyes, mouth and nose. A lick on a person's intact skin is not classified as an equivalent rabies exposure.

The virus travels along peripheral nerves to the spinal cord and then the brain. After multiplying in the brain, it spreads to sites including the salivary glands. Damage to nervous tissue changes behaviour and causes other neurological signs.

Incubation and infectiousness

Clinical disease in dogs most often develops around 21–80 days after exposure. The incubation period can be shorter or considerably longer. The interval between infection and signs in animals is also commonly reported as 1–2 months, sometimes up to 6 months.

The virus can be shed in saliva before a dog looks ill. In dogs, cats and ferrets, shedding has been described up to 10 days before signs begin. Viral shedding in saliva can be intermittent.

Risk factors

A dog's exposure risk is assessed from their country of origin, travel, vaccination records and animal contacts. In some regions, rabies persists particularly in wild carnivores. A dog can be exposed through direct bite contact with an infected fox or raccoon dog, for example. A rabid fox or raccoon dog may lose its usual fear of people and approach homes during daylight.

Vaccination prevents infection, but infection acquired before vaccination can still develop into disease. A healthy appearance alone cannot establish that a recently exposed dog is uninfected.

Transmission of bat lyssaviruses to dogs or other domestic animals is extremely rare. A surveillance account from northern Europe reports that the bat lyssaviruses detected there had not been found in livestock or pets. Bats living in an attic pose very little infection risk to people without direct contact. A bite from a sick bat is nevertheless assessed as an exposure, and bats must not be handled with bare hands.

Typical symptoms

Rabies can appear in furious or paralytic forms, and the pattern can change in the same animal. The paralytic, or quiet, form is more common than the furious form. A dog's early phase may go unnoticed by their owner. Possible signs include:

• A sudden change in temperament or normal behaviour.
• Restlessness, irritability or unusual sensitivity to stimuli.
• Attacking and biting with very little provocation.
• Withdrawal and unusual quietness.
• Profuse drooling, difficulty swallowing and a hanging lower jaw.
• Wobbling, seizures or progressive paralysis.

An affected puppy may initially seek human company with unusual playfulness. They may nevertheless bite even when stroked and rapidly become aggressive. A dog may also lose their appetite or develop altered vocalisation. The early phase of vague signs often lasts around 1–3 days. In the paralytic form, a dog may not appear angry or try to bite. Examining the mouth or giving medication with bare hands can then expose a person to the virus.

Complications and consequences

Progressive paralysis and death

Rabies in a dog with signs is incurable and fatal. Paralysis can spread from the throat and jaw muscles throughout the body. The final stage may involve coma and failure of breathing and other vital functions. The animal usually dies within a few days of signs developing. In the quiet paralytic form, the final stage can progress to death within only a few hours.

Exposure of other animals and people

An infected dog can transmit the virus in saliva to other mammals and people. Protecting people requires assessment of possible exposure before symptoms begin. Worldwide, dogs are the source of infection in up to 99% of human rabies cases. This figure describes human infections worldwide, rather than an individual pet dog's likelihood of developing rabies.

Diagnosis at the vet

Suspicion is based on signs and exposure

Abnormal behaviour and paralysis can raise suspicion of rabies, but similar signs occur in other diseases. Aggression alone does not show that a dog has rabies. Decisions about human exposure therefore cannot rely solely on an assessment of signs. The official veterinary service examines the suspected animal and determines further action using the information provided.

The official veterinary service also investigates whether a suspected wild animal has bitten people or domestic animals along its route.

Laboratory confirmation

Animal rabies is confirmed in brain tissue after death; there is no equivalent definitive rule-out test for a living dog. Tests are performed by a designated competent laboratory. In one national system, the veterinary authority investigates all suspected rabies cases. Submission of samples is arranged by the official veterinary service.

The laboratory can detect viral antigen using immunofluorescence. PCR methods looking for viral genetic material are also used in diagnosis. An appropriate brain tissue sample includes the brainstem and cerebellar regions. Owners do not collect or handle these samples themselves.

Rabies antibodies measured in blood after vaccination assess the vaccine-induced response. A vaccination certificate or antibody result therefore does not replace infection testing in an animal with suspicious signs.

Treatment

Clinical disease and official decisions

Rabies in a dog with signs cannot be cured with medicines. When infection is suspected, preventing further bites and saliva exposure and carrying out measures ordered by the authorities are essential. Some national rules require owners to report a well-founded suspicion of rabies to the official veterinary service as soon as possible.

Under one national procedure, if the official vet considers rabies in a domestic animal likely, the veterinary authority orders isolation and health monitoring for at least 2 weeks. This is arranged under official instructions, rather than as an owner's ordinary home observation. Under that procedure, euthanasia is ordered if safe isolation cannot be achieved or suitable premises are unavailable. Release from isolation depends on an official veterinary re-examination finding no signs suggestive of rabies. A euthanised animal is tested for rabies. Necessary samples are also arranged if an animal dies during isolation.

Under this procedure, the official veterinary service also promptly informs the doctor responsible for communicable diseases about suspected or confirmed rabies.

Prompt medical assessment for an exposed person

A person potentially exposed to rabies immediately washes a bite or scratch wound with soap and water for at least 15 minutes. They seek medical assessment without delay. Post-exposure prophylaxis may include a human rabies vaccine and, according to the situation, rabies antibodies. Treatment aims to prevent the virus reaching the central nervous system before symptoms develop. Previous preventive vaccination in a person does not remove the need for post-exposure medical assessment.

Prevention

Rabies is prevented by vaccinating dogs and reducing risky contacts. Some national veterinary authorities recommend regular rabies vaccination for resident pet dogs as well. Some national rules make current rabies vaccination compulsory for hunting dogs and dogs working for the authorities. Check the validity period entered by your vet on the vaccination certificate. Further information is available on dog vaccinations.

One set of pet travel and import rules requires identification before rabies vaccination. Under those rules, a pet's details and valid vaccination are documented in a pet passport. The travel waiting period after a first vaccination is usually at least 21 days. Depending on the vaccine, the wait may be longer. A booster given before the previous vaccination expires does not require a new 21-day travel wait under those rules. An ordinary vaccination card does not replace the required pet passport. Exceptions for young puppies and other conditions are assessed separately according to the departure and destination countries' rules.

In at-risk areas, vaccinating at least 70% of dogs can reduce human cases to zero. Vaccinating small wild carnivores reduces rabies spread within animal populations. Some wildlife control programmes use vaccine baits for small carnivores. Do not approach sick or unusually tame wild animals with your dog. Do not touch a bat with bare hands, and report a suspicious bat to the official veterinary service.

Important for dog owners

Be ready to describe your dog's country of origin, travel history, vaccinations and possible bite contacts. Record when signs began and all people or animals your dog may have bitten or whose wounds may have contacted saliva. Also report contact with a bat or small wild carnivore that appeared ill.

Contact the official veterinary service before trying to transport a suspected animal or examine their mouth. They will give instructions appropriate to the situation. Keep people and other animals away from a potentially infectious dog without exposing yourself to capture or a bite. Do not try to give water or medication or examine the throat with bare hands. Examining the mouth can expose you to rabies virus even when a dog is unusually quiet.

Particular caution is needed even when handling a suspected animal that has died. Do not touch a suspected animal if you have wounds on your hands. Leave arrangements for sampling and handling the body to official instructions.

Frequently asked questions

Can a dog with rabies look healthy?

Yes. Weeks or months can pass between infection and signs. The virus can be shed in saliva before obvious illness. Possible bite exposure is therefore assessed using the animal's origin and the contact, rather than their current appearance alone.

Is a dog with rabies always aggressive?

No. In the quiet form, a dog may withdraw and may not try to bite. Difficulty swallowing, drooling and progressive paralysis can nevertheless be associated with rabies. Examining such a dog's mouth or giving medication with bare hands can expose a person.

Can a vaccinated dog develop rabies?

A vaccinated dog can develop rabies if infection was acquired before vaccination. Vaccination records nevertheless remain an important part of protection and travel documentation. A dog with signs or possible exposure is assessed under official veterinary instructions even if vaccination is recorded.

Does rabies show up in a routine blood test?

Animal rabies is confirmed after death in brain tissue, and there is no equivalent definitive rule-out test for a living dog. Rabies antibodies measured in blood are used to check the vaccination response. A vaccine antibody result therefore answers a different question from laboratory confirmation of suspected disease in a dog with signs.

What should I do if a suspected dog bites a person?

Immediately wash the person's bite wound with soap and water for at least 15 minutes, and seek medical assessment without delay. The need for possible post-exposure prophylaxis is assessed using the exposure details. Examination of the animal and further action are arranged under official veterinary instructions.