This article reviews the current literature on osteoarthritis in pet and laboratory guinea pigs. The associated clinical signs, diagnosis and treatment of osteoarthritis in pet guinea pigs will be discussed, with options for analgesia detailed. This condition is thought to be common in pet guinea pigs, even from an early age in some genetic lines, although osteoarthritis often goes undiagnosed in this species until advanced disease is present, posing a major welfare concern. Increasing awareness of this condition in veterinary practitioners should aid early diagnosis in pets and help improve their quality of life. Prevention may be possible using oral protective nutritional supplements to slow down the progression of this disease at an early stage. Lifestyle changes are also discussed for the management of this condition in pet guinea pigs.