What's the tapeworm treatment window for dogs returning to GB?
Your dog's tapeworm treatment must be given by a vet no less than 24 hours and no more than 120 hours (5 days) before you arrive back in Great Britain. Treatment outside that window — even by an hour — doesn't count, and your dog may need re-treatment before you can travel home.
Last verified against gov.uk: 26 July 2026.The window is arrival-relative, not departure-relative
This trips people up constantly: the 24–120 hour window is counted backwards from your arrival time in Great Britain, not from when you leave the EU. If your ferry or flight is delayed, your treatment window can close before you actually arrive — plan with some margin.
Who needs to give the treatment
The treatment must be administered and recorded by a vet — not the owner, and not just any pill from a pet shop. It must contain praziquantel (or an equivalent product effective against Echinococcus multilocularis), and the vet records the exact date and time on your dog's Animal Health Certificate.
Where treatment happens depends on your trip length
Trip of 5 days or less: you can get the tapeworm treatment done by a UK vet before you leave, timed so it still falls within the window when you return. Longer trip: you'll need to find a vet in the EU to treat your dog shortly before you head home. Vets across the EU are used to this — it's been a routine request for years.
Exempt countries
You don't need this treatment if you're travelling directly from Finland, Ireland, Malta, Northern Ireland, or Norway — these countries are exempt from the requirement.
Worked example
Your dog is treated for tapeworm at 1pm on a Monday. You cannot arrive back in Great Britain before 1pm on Tuesday (the 24-hour minimum hasn't passed), and you cannot arrive after 1pm on the following Saturday (the 120-hour window has closed). Anywhere in between is fine.
Common mistake
The most frequent error is timing the treatment to your departure from the EU rather than your arrival in the UK — if your crossing takes longer than expected, or you have a stopover, you can accidentally fall outside the window without realising it.
What to do if you're not sure
If your travel plans are uncertain or subject to delay, ask your vet's advice on timing before you finalise it — they can help you build in a margin either side.