• 
  Oak Barn Vets

  Shalford
• 
  Oakhouse Vets - Mapperley

  Arnold
• 
  Oakmount Veterinary Centre

  Burnley
• 
  Oakwood Vets

  Harleston
• 
  Oban Veterinary Surgeons

  Oban
• 
  Ocean Vets - Alderholt

  Alderholt
• 
  Old Hall Vets

  Appleby-in-Westmorland
• 
  Old Mill Veterinary Practice

  Stornoway
• Old School Veterinary Practice - Harrapool, Broadford

  Isle of Skye
• Old School Veterinary Practice - Kyle of Lochalsh

  Kyle of Lochalsh
• 
  Old Stone Vets - Alston

  Alston
• 
  Orchard Vets - Romsey

  Romsey
• 
  Orford Vets

  Warrington
• 
  OrtonVets

  Peterborough
• 
  Otter Vets - Sidmouth

  Sidmouth
• 
  Oval Pet Centre - Sidcup

  Bexley
• 
  Oval Pet Centre - Welling

  Bexley
• 
  Oxford House Veterinary Clinic

  Tonypandy
• 
  PARC Vet Care

  Bangor
• 
  Paddons Vets

  Wisbech
• 
  Palmerston Veterinary Group - Buckhurst Hill

  Buckhurst Hill
• 
  Park Hall Vets

  Mansfield Woodhouse
• 
  Park Hill Vets

  Tiverton
• 
  Park Issa Vets - New Foundry

  Rhosllannerchrugog