Multiple sclerosis and dog ownership. A case-control investigation

Area of Science:

• Neurology
• Epidemiology
• Environmental Health

Background:

• Previous research suggested a potential association between small dog ownership and multiple sclerosis (MS).
• This prompted further investigation into the role of pet exposure in MS etiology.

Purpose of the Study:

• To examine the association between past exposure to house pets and the risk of developing multiple sclerosis.
• To replicate and validate findings from earlier studies on pet ownership and MS.

Main Methods:

• A case-control study was conducted with 72 patients diagnosed with definite multiple sclerosis (MS).
• Two matched hospital controls (age, sex, residence) were selected for each MS patient.
• Interviews were conducted with cases and controls regarding past exposure to pets and animals.

Main Results:

• No significant difference was found in the proportion of MS cases and controls who had lived with dogs.
• Exposure duration and the number of dogs owned did not differ between cases and controls.
• No increased risk of MS was associated with early-life or pre-onset exposure to dogs or other house pets.

Conclusions:

• The study suggests that exposure to house pets and domestic animals is unlikely to be a significant etiological factor in multiple sclerosis.
• Findings do not support a link between pet ownership and the development of MS.