I can answer a little bit but im sure someone knowledgable will answer the rest since i've never done it (yet).
You go abroad, before you return (at least 24 hours) you find a vet on the return journey, from what i understand they dont need to be anything special just a vet that can adminsiter the tick and flee dosage or even watch while you do it, they then stamp your pets passport with the date and time.
You must cross after 24 hours after treatment and before 48 hours after treatment, thats to give the stuff time to work and not to long to wear off.
The problem with going over to often is pets are only meant to be treated every so many weeks (we do ours 6 weeks) so if you went over every couple weeks they would be getting to much of the chemical used and this could be harmful.
Cant tell you any more i'm afraid and im happy to be corrected if i got anything incorrect just trying to help out.
Kevin
You go abroad, before you return (at least 24 hours) you find a vet on the return journey, from what i understand they dont need to be anything special just a vet that can adminsiter the tick and flee dosage or even watch while you do it, they then stamp your pets passport with the date and time.
You must cross after 24 hours after treatment and before 48 hours after treatment, thats to give the stuff time to work and not to long to wear off.
The problem with going over to often is pets are only meant to be treated every so many weeks (we do ours 6 weeks) so if you went over every couple weeks they would be getting to much of the chemical used and this could be harmful.
Cant tell you any more i'm afraid and im happy to be corrected if i got anything incorrect just trying to help out.
Kevin