Arrange a veterinary or shelter-clinic assessment, and keep the dog separated from other animals until it has been assessed—especially if it seems ill. A stray with no reliable vaccine records generally needs a veterinarian-directed vaccination plan, parasite screening and prevention, and a check of local rabies rules. The schedule below is a U.S. shelter-care starting point, not a one-size-fits-all plan for a dog living in a home.
What to do first
- Get help safely. Do not approach or try to capture an unfamiliar dog if doing so could lead to a bite. Contact local animal control, a shelter, or a veterinary clinic for safe-trapping advice and an assessment.
- Keep the dog apart from other animals. Until a veterinary professional advises otherwise, use separate space and avoid shared bowls, bedding, and toileting areas. Tell the clinic about any signs of illness and the dog’s known or suspected contact with other animals.
- Bring any records you have. A veterinarian can use reliable vaccination documents, age and health findings, likely exposure, local disease risks, and applicable laws to make an individual plan. Without reliable records, do not assume the dog is protected.
For vomiting, diarrhea, visible worms, a swollen abdomen, weight loss, weakness, or other concerning signs, seek veterinary care rather than choosing an over-the-counter dewormer. A dog’s age, weight, health, pregnancy status, likely parasite, and location can all affect what treatment is appropriate.
How shelter care differs from care at home
| Care setting | Main priorities |
|---|---|
| Shelter or rescue intake | Rapid core vaccination, closely spaced puppy boosters, measures to reduce respiratory disease spread, and parasite treatment at or before intake. Shelter protocols reflect the risks of crowded settings and are directed by veterinary staff. |
| Home after rescue or adoption | A veterinarian reconciles records and continues any needed vaccine series. Ongoing parasite prevention and testing are selected for the dog’s age, health, lifestyle, location, and household risks. |
The Association of Shelter Veterinarians’ 2022 standards call for antiparasite treatment at or before intake and throughout a shelter stay. A dog moving from a shelter to a home may need a different follow-up plan; do not copy a shelter protocol mechanically.
Which vaccines are usually considered?
Core vaccines and missing records
AAHA’s U.S. canine vaccine guidance, updated in 2024 to make leptospirosis a core vaccine, identifies protection against distemper, adenovirus, parvovirus, leptospirosis, and rabies as core. AAHA’s general guidance says that when a dog’s vaccine history is unknown or overdue, vaccination is usually favored, subject to medical considerations and local law. That is not a reason to administer vaccines yourself: a veterinarian should choose the products and timing.
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Shelter intake schedule for distemper, adenovirus, and parvovirus
For dogs and puppies at least 4 weeks old entering shelter care without sufficient, reliable records, AAHA recommends a modified-live DA2PP vaccine at or before entry. In its 2022 shelter guidance, AAHA recommends repeating it every 2–3 weeks until puppies reach 18–20 weeks of age. The 2022 ASV standards call for puppy vaccines every two weeks through 20 weeks in shelter facilities.
For shelter dogs older than 18–20 weeks, AAHA recommends an initial DA2PP dose and a booster 2–3 weeks later, given in the shelter or arranged with the adopter’s veterinarian. The closely spaced shelter schedule is intended for a higher-exposure setting. In AAHA’s general schedule, young puppies receive at least three doses of the distemper/adenovirus/parvovirus combination between 6 and 16 weeks, 2–4 weeks apart; dogs over 16 weeks generally receive two doses 2–4 weeks apart. Maternal antibodies can interfere with early puppy doses, which is why the series continues into later puppyhood.
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Leptospirosis
AAHA shelter guidance says not to start leptospirosis vaccination before 12 weeks of age. For dogs older than 12 weeks in shelter care, it describes a quadrivalent dose at intake followed by a booster three weeks later. AAHA’s general schedule lists two initial doses 2–4 weeks apart, a dose within one year after the primary series, and annual boosters. The veterinarian should check the specific product label, the dog’s history, and current local guidance.
Respiratory disease and other risk-based vaccines
For shelter dogs older than 3 weeks, AAHA recommends intranasal Bordetella bronchiseptica and canine parainfluenza vaccine, with or without CAV-2, at or before entry. Its shelter guidance says injectable Bordetella is a poor substitute in that setting because onset is slower and the local upper-airway response is less robust. AAHA does not recommend routine shelter vaccination for Lyme disease or canine influenza, but local disease patterns, an outbreak, or an individual dog’s circumstances may affect a veterinarian’s decision.
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Rabies vaccination and local law
AAHA’s shelter guidance recommends one parenteral rabies dose for dogs older than 12 weeks before release from shelter care. The general AAHA schedule defers timing to applicable law. State and local rules determine when a rabies vaccine may be given and who is authorized to give it, so check with a veterinarian or local public-health authority.
What parasite treatment, testing, and prevention may be needed?
At intake: treat common intestinal worms under veterinary direction
ASV and ASPCApro shelter guidance supports treatment for roundworms and hookworms at or before intake, ideally on entry, alongside a written parasite-control program tailored to regional and facility conditions. ASV calls for veterinary supervision of medications and environmental control, with decisions adjusted for the dog’s life stage, health, pregnancy or lactation, and effects on other animals and people. Not every animal needs testing or treatment for every parasite; the veterinarian can tailor the workup to signs and local risks.
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There is no universal dewormer or dose for every stray. Do not give a product without veterinary direction: the appropriate choice depends on factors such as the dog’s weight and age, symptoms, likely parasite, heartworm status, other illness, pregnancy, geography, and the product label.
After intake: prevention and follow-up testing
CAPC’s dog guidance, last updated April 24, 2025, recommends year-round broad-spectrum parasite control effective against heartworm, intestinal parasites, fleas, and ticks. It also recommends annual heartworm testing. The veterinarian can select prevention based on test findings and the dog’s individual risks.
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For puppies, CAPC recommends anthelmintic treatment beginning at 2 weeks of age and repeating every two weeks until regular broad-spectrum control begins. A veterinarian should determine what, if anything, a rescued puppy still needs based on its age, history, health, and prior treatment.
CAPC recommends fecal examinations at least four times during the first year of life and at least twice a year for healthy adult dogs. A veterinarian may recommend a different frequency based on health, outdoor exposure, travel, or contact with other animals. Ask the clinic whether to bring a fresh fecal sample and how to collect and store it; the clinic may provide a container.
Reduce exposure at home
- Pick up feces promptly and wash your hands after handling the dog or cleaning its area.
- Avoid touching feces or urine with bare hands.
- Follow the clinic’s advice on cleaning the dog’s space and limiting contact with other pets while evaluation or treatment is underway.
These steps matter because some parasites can affect people as well as animals.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What if the dog has bitten someone or may have been exposed to rabies?
Contact a veterinarian and animal control promptly if the dog has bitten a person or may have encountered a rabid animal. Public-health authorities determine whether observation or other action is required. The AVMA says no post-exposure rabies treatment is approved for animals. If a person was bitten, wash the wound and seek prompt medical advice.
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