Veterinarians recommend regular wellness exams for the same reason your physician and dentist recommend them – if you can detect a problem in its early stages, it's more likely to be treated and resolved with less expense, less difficulty and better success.
As the saying goes, an ounce of prevention is worth a pound of cure. Vaccinations, heartworm prevention and routine deworming are important components of wellness care and can prevent diseases that are not only life-threatening, but very expensive to treat.
Your veterinarian can recommend a wellness program based on your pet's breed (some breeds are predisposed to certain health problems), age, lifestyle and overall health.
2017 American Veterinary Medical Association