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Pulmonic stenosis (PS) is one of the three most common congenital cardiac defects in dogs. It is much less common in cats, and is usually recognised in association with other congenital cardiac defects in this species.

Pulmonic stenosis (PS) is one of the three most common congenital cardiac defects in dogs. It is much less common in cats, and is usually recognised in association with other congenital cardiac defects in this species.

Pulmonic stenosis may be '''subvalvular/infundibular'''  (occurs below the valve), '''valvular''' (occurs at the valve) or'''Supravalvular''' (occurs above the valve).'''Most '''cases of PS in the dog are '''valvular''', whilst supravalvular PS is rare.   

Pulmonic stenosis may be '''subvalvular/infundibular'''  (occurs below the valve), '''valvular''' (occurs at the valve) or '''Supravalvular''' (occurs above the valve). '''Most '''cases of PS in the dog are '''valvular''', whilst supravalvular PS is rare.   

'''Subvalvular (infundibular)''' PS is defined as a fibrous or fibromuscular diaphragm below the pulmonic valve or at the os infundibulum, or a more diffuse and extensive area of fibromuscular hypertrophy creating more of a tunnel or hour-glass deformity of the infundibulum.

'''Subvalvular (infundibular)''' PS is defined as a fibrous or fibromuscular diaphragm below the pulmonic valve or at the os infundibulum, or a more diffuse and extensive area of fibromuscular hypertrophy creating more of a tunnel or hour-glass deformity of the infundibulum.