Petplan ultimate with condition for life for us.
Our rescue dog had both his front elbows operated on last spring, it turned out £2k per leg vets fees, they dealt directly with the vets, settled the bill no issue & paid for all his medicine. If he’s needed to stay of the medicine for life, they’d have paid for that too. Our cat is insured by them too.
There are a few people we know who have gone for cheaper cover and the dogs are seriously ill or need big operations where they have had to find the rest themselves and if its vets bills they rack up quickly.
Most vets seem to prefer petplan because they pay out for the majority of claims where others don’t. I have no affiliation to them, but in my experience of having to use them they have been great.