Sorry but thats not true. It may be the case in human medicine but in veterinary medicine we would never change the dose on a daily basis. The gold standard is an 24 blood glucose curve for dogs or a fructosamine test in cats. Insulin dose shold only be changed on the basis of these and no more often than weekly. See pet diabetes dot co dot uk for more details.

Schedule 3, Part 1, of the Veterinary Medicines Regulations 2006 lists the conditions for prescribing authorised veterinary medicines. For POM-V (prescription only) medicines, before prescribing the product the vet must carry out a clinical assessment of the animal, and animal must be under the vet’s care Actually the RCVS have never defined 'under my care' but the BVA now do... For small animals, in the case of routine prophylactic anti-parasitic agents the time interval between re-assessments should be no longer than twelve months. All other re-assessments should be carried out at intervals which do not exceed six months, but in many cases professional judgement may require a considerably shorter period. That is copy and pasted from their members only discussion document. It is generally accepted within the profession than 'under my care' means an examination every 3-6mths. This is similar to the requirement of a GP asking to see you every 3-6mths when on long term medication. It is not about profiteering...its about doing the best for your pet. No vet wants to harm a pet by prescribing a medicine that harms a pet- and that includes underdosing thyroid medications because a dog's needs has changed (and yes that does happen!) Perhaps when doing your online research you might look at the cost of seeing a private doctor or dentist. I think that you will find veterinary surgeons a bargain by comparison. I wouldn't buy an expensive car or boat if I couldn't afford to run it. Its the same with pets- they are not a right but a luxury and if you can't afford the running costs don't get one!