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Hi, Welcome to JustAnswer. You're through to Dr Chris, a small animal Vet based in the UK. I am reviewing your question and will get back to you shortly.
Sorry to hear this. Prinovox will not actually prevent ticks, it is only a flea and roundworm treatment. I would suggest a Seresto collar if you are looking for a good quality none prescription flea and tick treatment. See https://www.petdrugsonline.co.uk/seresto-dog-flea-collar-with-tick-control?gclid=CjwKCAjwt-L2BRA_EiwAacX32ZBmw0oD1Pd79nj3YQFV0qswr6txSm6RFDWIwi6v8eiFBWa9N6VkRhoC2ekQAvD_BwE
These work very well and last for 8 months.
I hope that answers your question? Please let me know if you need any further help or advice.