Going north is the easy leg. To bring a pet dog into Canada from the US, the core document is a rabies vaccination certificate — USDA APHIS describes it as “issued by licensed vet, proving vaccination within 3 years of importation into Canada,” and says the certificate “should clearly identify your pet and must minimally include its sex, age, and breed.” For a dog over eight months travelling with you, no health certificate is required.
Coming home is where people get caught. Since 1 August 2024, every dog entering or returning to the United States — including an American dog that spent one afternoon in Ontario — has to clear CDC’s import rule. That means a CDC Dog Import Form receipt, a microchip, and a minimum age. CDC’s own wording is blunt: “Dogs must be at least 6 months old at time of entry or return to the U.S.”
Why the return leg is the one that bites
The mental model most people carry is that leaving your own country is the bureaucratic part and coming home is automatic. For dogs crossing the US–Canada line, it is exactly inverted.
Canada’s side is a vaccination question. The US side is an eligibility question, and the rule does not care where the dog lives. CDC’s framing covers dogs “entering or returning to” the United States, which is why a border town resident who drives across for a weekend is in the same rule as someone importing a rescue from overseas.
The good news is that Canada is not a high-risk country for dog rabies, which puts you in the simplest of CDC’s pathways. CDC’s high-risk country list — last updated 15 April 2026 — does not include Canada, and the page states the rule plainly: “If a country or political unit is not listed below, it is not considered high risk for importing dog rabies into the United States.” Mexico is not on it either.
That matters because the high-risk pathway is a different world — reserved ports of entry, an animal care facility booking, foreign vaccination certification. None of it applies to a dog coming back from Canada. What does apply is short, and it is absolute.
The four gates on the way home
For a dog that has been only in Canada (or any other non-high-risk country) in the previous six months, CDC lists four conditions:
- At least six months old at the time of entry or return.
- A microchip — specifically, one “that can be detected with a universal scanner to identify them.”
- Appears healthy on arrival.
- A CDC Dog Import Form receipt.
Note what is not on that list: a rabies vaccination certificate. CDC does not require one for a dog coming back from a low-risk country. Your vet will still want the dog vaccinated, your state may have its own rules, and Canada required the certificate on the way in — so you will be carrying it anyway. But it is not the document that gets you back across.
The form itself is less painful than it sounds. CDC’s instructions say you must “show the receipt (printed or on your phone) to the airline if the dog is traveling by air and to U.S. Customs and Border Protection on arrival in the U.S.” For low-risk countries the receipt is “valid for one dog to enter the United States multiple times from the same country within six months from the date of issuance” — so one submission covers a summer of weekend trips, as long as you keep going to the same country. The American Kennel Club’s summary of the revision makes the same point and adds the one-line version of the whole rule: “All dogs entering the United States must have a microchip and be over six months of age.”
For the low-risk pathway, the form asks for importer identification — a passport or driver’s licence number — plus the dog’s name, age, sex, breed and colour or markings. It does not ask you to type the microchip number (that is a high-risk-pathway field). The microchip requirement is still real; it is just checked on the dog rather than on the form.
What the two directions actually ask for
| US → Canada | Canada → US | |
|---|---|---|
| Governing body | CFIA, enforced by CBSA at the booth | CDC (APHIS only in disease-specific cases) |
| Rabies certificate | Yes — licensed vet, within 3 years, naming sex, age, breed | Not required by CDC from a low-risk country |
| Minimum age | Under 3 months exempt from rabies vaccination (carry proof of age) | 6 months, no exceptions |
| Microchip | Not the core requirement | Required, universal-scanner readable |
| Health certificate | Not required for a dog over 8 months travelling with you | CDC does not require general health certificates for pets |
| Online form | None for a personal pet | CDC Dog Import Form receipt |
The trap: a puppy cannot come home
Read the table again on the age row. Canada will let a twelve-week-old puppy in on proof of age. The United States will not let that same puppy back out of Canada and across the line, because six months is a floor with no travel exemption attached to it.
This is the single most expensive misunderstanding in the whole rule, and it has an obvious shape: somebody drives to Canada to collect a puppy, or takes a young dog along on a family trip, and discovers the problem at the booth. There is no version of the paperwork that fixes it. The only fix is time.
If you are picking up a dog in Canada, the practical planning rule is to work backwards from the dog’s six-month birthday and the microchip, not from the breeder’s or rescue’s ready date.
At the booth: declare, and carry originals
The document set is only half of it. The Canada Border Services Agency is explicit that an undeclared animal — “including family pets” — can be refused entry, confiscated or detained, and that officers have that authority when requirements are not met. CBSA also says you must be the importer of the dog and hold documentation proving ownership, and it “strongly recommended to always travel with the physical original copy of all required documents.”
That last line is worth taking literally. A photo of a rabies certificate on a phone is not what the page asks for, and a booth in February is not the place to discover that your vet clinic’s portal needs a login you do not remember.
On the US side, APHIS confirms who is in charge: “The U.S. Centers for Disease Control and Prevention (CDC) is the primary authority for dog imports,” and APHIS itself “has requirements only if your dog is coming from a country affected by foot-and mouth-disease (FMD) or screwworm.” Canada is neither. The same page flags a second layer people forget: state entry requirements can apply on top of the federal ones, set by the state you are driving into rather than by CDC.
What to have in the glovebox
- The original rabies vaccination certificate, signed by a licensed vet, showing the dog’s sex, age and breed, and a vaccination date within three years.
- The CDC Dog Import Form receipt — printed, and also saved offline on your phone. Border parking lots are not reliable places to load a webpage.
- The microchip number on paper, and a note of which registry it is with.
- Proof you own the dog — adoption paperwork, a vet record in your name, a licence.
- Proof of age if the dog is young enough for anyone to ask.
- A plan for the wait. Secondary inspection can take an hour with the engine off. Water, a bowl, and somewhere shaded for the dog to lie down matter more than the paperwork does once you are parked. The same discipline that makes a long road trip work applies here.
Cats are a different, much shorter story
Going north, APHIS puts cats in roughly the same position as dogs over eight months: a rabies vaccination certificate from a licensed vet, no health certificate, with kittens under three months exempt from the vaccination requirement.
Coming home, CDC says that “Cats are not required to have proof of rabies vaccination for importation into the United States,” and that CDC “requires that cats appear healthy upon arrival.” There is no cat version of the Dog Import Form, and no six-month age floor. Cats are, however, “subject to inspection at ports of entry and may be denied entry into the United States if they have evidence of a zoonotic disease.”
One asymmetry worth remembering: CDC “does not require general certificates of health for pets for entry into the United States” — but individual states and individual airlines do, which is why people keep being told they need one.
Crossing the border with a dog: FAQ
Do I need the CDC form if my dog lives in the US and we are only going to Canada for the day?
Yes. CDC’s rule covers dogs “entering or returning to” the United States, and does not carve out short trips or US-resident dogs. The one mercy is that the low-risk receipt is valid for six months of multiple entries from the same country, so a single submission covers a season of day trips to Canada.
Can I bring a puppy back from Canada?
Not until it is six months old. CDC states that dogs must be at least six months old at the time of entry or return to the US, and there is no exemption for a dog that already lives in the States. Canada’s own rules are looser on age, which is exactly why this catches people out in one direction only.
Does my dog need a rabies shot to get back into the US?
CDC does not require proof of rabies vaccination for a dog returning from a low-risk country such as Canada. You will still need the certificate to enter Canada in the first place, your destination state may require it, and vaccinating is the veterinary recommendation regardless. Treat “not required by CDC at the US border” as a narrow statement about one checkpoint.
Is a microchip really mandatory?
Yes, for dogs. CDC’s requirement is a microchip “that can be detected with a universal scanner.” Older chips on non-universal frequencies are the failure case to check for — ask your vet to scan the dog with a universal reader before the trip rather than assuming the chip you paid for years ago will read.
How far ahead should I fill in the form?
CDC’s instructions say there is no minimum advance notice and the form can be completed before travel, though you need time to receive the emailed receipt. Doing it the night before rather than in the queue is the sensible version of “you can do it on the day.”
What happens if I turn up without the paperwork?
On the Canadian side, CBSA can refuse entry, confiscate or detain an animal when requirements are not met, and an undeclared pet is explicitly named as a trigger. On the US side you are dealing with Customs and Border Protection and CDC’s rule. Neither outcome is a fine you can pay at the window and drive on.
Is the train or bus any easier than driving?
The import rules are identical — they attach to the dog, not the vehicle. The operator’s own pet policy is the extra layer, and it is usually the stricter one. We go through who carries pets and on what terms in can you take a dog on a train or a bus.
Bottom line
Treat this as two separate checklists that happen to be stapled to the same trip. Northbound, one original certificate from a licensed vet, and a declaration at the booth. Southbound, a form receipt, a readable microchip, and a dog that is old enough — and if the dog is under six months, there is no trip, only a date to wait for.
Both governments publish their own pages and both change them. The CDC high-risk list alone was revised in April 2026. Open the official pages the week you travel, not the year you first read about the rule.
Sources
- CDC — Entry Requirements for Dogs from Dog-Rabies Free or Low-Risk Countries (minimum age six months; universal-scanner microchip; appear healthy; CDC Dog Import Form; entry at any airport, seaport or land border) (checked 2026-09-17)
- CDC — CDC Dog Import Form and Instructions (receipt shown printed or on a phone to the airline and to CBP; low-risk receipt valid for multiple entries from the same country for six months; fields required) (checked 2026-09-17)
- CDC — High-Risk Countries for Dog Rabies (Canada and Mexico not listed; unlisted countries are not considered high risk; list updated 15 April 2026) (checked 2026-09-17)
- CDC — Bringing an Animal into the U.S. (cats not required to show proof of rabies vaccination; cats must appear healthy; no general health certificate required by CDC) (checked 2026-09-17)
- USDA APHIS — Pet Travel From the United States to Canada (rabies certificate from a licensed vet within three years, naming sex, age and breed; no health certificate for dogs over eight months; dogs under three months exempt from vaccination with proof of age) (checked 2026-09-17)
- USDA APHIS — Bring a Pet Dog into the United States (CDC is the primary authority; APHIS requirements apply only for FMD or screwworm countries; state entry requirements may also apply) (checked 2026-09-17)
- Canada Border Services Agency — Travelling with animals (undeclared family pets may be refused entry, confiscated or detained; importer must hold proof of ownership; travel with physical original documents) (checked 2026-09-17)
- American Kennel Club — CDC Revises Requirements for Importing Dogs Older Than 6 Months from Low-Risk Countries (receipt may be filled out the day of travel and shown printed or by phone; valid six months for multiple entries; microchip and six-month age requirement) (checked 2026-09-17)
Import rules and country risk lists change. Confirm on the official CDC, APHIS and CFIA pages before you travel, and ask your veterinarian about anything to do with your dog’s health or vaccinations.
