For “acute”, sometimes traumatic, events that are difficult to predict, we recommend you give a double dose two hours before the event and, if necessary, repeat the dose four hours later.
Travelling by plane is very stressful for pets (they’re put in a carrier, separated from their owner, in the hold all alone), so if your dog has to take a flight we recommend you double the dose of Zen Supp two days before departure and repeat the dose when you put him in his carrier. If in doubt, don’t hesitate to ask your vet for advice.