From a serological survey of 98 dogs, the overall prevalence of subcli
nical neosporosis among dogs in Denmark was estimated as 15.3%. From a
questionnaire completed at the time of blood sampling in 87 dogs, it
was found that exposure to cats could be a:risk factor for the infecti
on in dogs (odds ratio 3.46; 95% confidence limit 1.1-11.4). Further,
it was shown that the antibody response in a pregnant dog increased ma
rkedly during gestation, suggesting that the parasite may be reactivat
ed during pregnancy in a manner resembling that of Toxocara canis.