Kyphosis means an abnormal, excessive upward curvature of the spine — often seen in the midback (thoracic) region.

 

In dogs, particularly French Bulldogs, Pugs, English Bulldogs, Boston Terriers, and other brachycephalic or screw-tailed breeds, this can be caused by congenital vertebral malformations (deformed vertebrae such as hemivertebrae).

 

When the curvature becomes unstable or compresses the spinal cord, it can cause pain, weakness, or paralysis — often at a young age (4–18 months).

 

Surgery is indicated for dogs with neurologic deficits or spinal instability, while mild, nonprogressive cases may be managed conservatively.

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