The most commonly affected breeds include terriers, Bulldogs, Miniature Schnauzers, Chihuahuas, Samoyeds, Beagles, Keeshonds, Mastiffs, and Bullmastiffs.

• 常见于梗类犬、[[斗牛犬]]、迷你型[[雪纳瑞]]、[[吉娃娃]]、[[萨摩耶犬]]、[[比格犬]]、[[凯斯犬]]、獒犬和[[斗牛獒]]。临床症状包括运动不耐，但大多数病例仅有心脏杂音。