Iliopsoas Strain

An iliopsoas strain refers to an injury affecting one of the deep hip flexor muscles that runs from the lower spine and pelvis to the inner thigh. This muscle group is involved in lifting the hind leg forward during walking and running, and strain can occur from sudden exertion, repetitive activity, or awkward movement. The injury may involve stretched fibres, partial tears, or inflammation within the muscle or its tendon. Owners often notice a change in how their dog moves—perhaps a subtle shortening of stride on one hind leg, reluctance to jump into the car, or stiffness after rest that seems to ease with gentle movement. The signs can be intermittent and may not always look like obvious limping. Some dogs show discomfort when stretching that leg backward or when rising from lying down. This page explores the patterns that may suggest iliopsoas involvement, what happens within the muscle and surrounding structures during strain, how the condition is investigated through examination and imaging, and the range of approaches used to support recovery and manage discomfort.