Risk factors for development of dysautonomia in dogs

Objective-To identify risk factors associated with dysautonomia in dogs. Design-Case-control study. Animals-42 dogs with dysautonomia examined between October 1988 and January 2000 and 132 control dogs examined during the same period for an unrelated problem. Procedure-Information was gathered from medical records and surveys mailed to owners of case and control dogs. Results-42 case and 132 control dogs we re included; completed surveys were returned by owners of 30 case and 103 c ontrol dogs. Dogs with dysautonomia were significantly younger (median, 18 months) than control dogs (median, 60 months) and more likely to come from rural areas and to spend greater than or equal to 50% of their time outdoor s. Compared with rural control dogs that spent at least some time outdoors, affected dogs were more likely to have access to pasture land, farm ponds, and cattle, and to have consumed wildlife, at least occasionally. The larg est numbers of dogs with dysautonomia were identified during February and A pril, with relatively few dogs identified during the summer and early fall. Conclusion and Clinical Relevance-Although the cause of dysautonomia is unk nown, results suggest that dogs with dysautonomia were significantly more l ikely to live in rural areas and spend greater than or equal to 50% of thei r time outdoors than were control dogs examined for unrelated diseases.