The Clumber Spaniel is a breed of dog of the spaniel type, developed in the United Kingdom. Initial signs are usually first noted when the dog is between five and twelve months old, and may include a swaying hindleg gait, hindleg lameness, muscle wastage around the hindquarters, reluctance to and fatigue during exercise, inability to climb stairs or jump up. The dog can appear hunched up with an arched back, and in the very worst cases may wince with pain when moving its hindlegs. Initial signs are usually first noted when the dog is between five and twelve months old, and may include a swaying hindleg gait, hindleg lameness, muscle wastage around the hindquarters, reluctance to and fatigue during exercise, inability to climb stairs or jump up. The dog can appear hunched up with an arched back, and in the very worst cases may wince with pain when moving its hindlegs. Medical treatment can vary from the administration of painkillers to surgical correction depending on the severity of the condition.