• 
  North Weald Vets

  North Weald Bassett
• 
  Northvet - Harray

  Orkney
• 
  Northvet - Kirkwall

  Kirkwall
• Northwest Veterinary Specialists

  Runcorn
• 
  Northwich Vets

  Lostock Gralam
• 
  Nurture Vets - Wells

  Wells
• 
  O'Reilly & Fee Armagh Vets

  Armagh
• 
  Oak Barn Vets

  Shalford
• 
  Ocean Vets - Alderholt

  Alderholt
• 
  Old Hall Vets

  Appleby-in-Westmorland
• Old School Veterinary Practice - Harrapool, Broadford

  Isle of Skye
• 
  Orchard Vets - Romsey

  Romsey
• 
  OrtonVets

  Peterborough
• 
  Oundle & Thrapston Vets - Oundle

  Oundle
• 
  Oundle & Thrapston Vets - Thrapston

  Thrapston
• 
  Oval Pet Centre - Sidcup

  Bexley
• 
  Oxford House Veterinary Clinic

  Tonypandy
• 
  PARC Vet Care

  Bangor
• 
  Park Hill Vets

  Tiverton
• 
  Park House Veterinary Centre

  Stafford
• 
  Park View Vet Hospital - Park View

  North Hykeham
• 
  Parkhill Vets

  Wetherby
• 
  Parklands Vets - Dungannon

  Dungannon
• 
  Pattenden Vets

  Marden