Our two are on Advocate spot on for their worming/flea control because there have been cases of lungworm in the area and they're both partial to a bit of slug re-location. Even online, Advocate is about £16 for a three month supply plus the cost of a veterinary prescription, about £12, £76 pa. Add the cost of the annual vaccination, around £42, two full checkups at about £40 each and you're already well beyond the cost of a yearly plan.
My vet gives me a six month supply of Advocate and Drontal for each of our dogs whenever we go to her for their six monthly check, there's no charge as it's covered by the vet plan and it's applied by me at home.
I'm all in favour of economising wherever possible but not as far as my dog's health is concerned. There have been scares about buying drugs online and finding they're not effective so I'll not take the risk and recently there have been reports of microchips, even from a reputable company, going faulty.
I prefer to have anything remotely "veterinary" done by my local vet as she knows us and our dogs, she knows the various diseases and parasites that are going the rounds in our area and she owns an absolutely gorgeous cocker spaniel
but, above all, she's qualified, I'm not, and vets carry insurance just in case something wrong
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Bob.