[Horner's syndrome in the dog: a retrospective study].

A retrospective study was made of 43 dogs with Horner's syndrome (HS). In the group studied the golden retriever was found to be predisposed for Horner's syndrome. No predisposition in gender or age seemed to exist. Symptomatic treatment with topical 10% phenylephrine alleviates the clinical signs. Generally patients recover in 2 to 6 months.