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In page Affenpinscher:

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The affenpinscher is prone to hip dysplasia.[4] As with many small breeds of dog, they are prone to collapsed trachea and luxating patella.[5] Some are prone to fractures, PDA, open fontanel and respiratory problems in hot weather. Ocular conditions such as cataracts are occasionally reported.[4][6] An emerging concern is syringomyelia, although the incidence is currently unknown.[7]