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This study was conducted to investigate sources of Yersinia enterocolitica 4/O:3 infections in dogs and cats.Transmission of Y. enterocolitica 4/O:3 to pets via contaminated pork was studied using PFGE with Not I, Apa I and Xho I enzymes. A total of 132 isolates, of which 16 were from cat and dog faeces and 116 from raw pork samples, were recovered in Finland during 1998–99. Cat 1, whose diet consisted mostly of raw pig hearts and kidneys, excreted Y. enterocolitica 4/O:3 of genotype G4. This predominant genotype was also found in isolates recovered from the pig heart, liver, kidney, tongue and ear, and minced pork samples. Dog 2, which was fed raw minced pork, excreted Y. enterocolitica of genotype G13. This genotype was also identified in isolates recovered from the pig heart, kidney and tongue, and minced pork samples.These results show that raw pork can be an important source of Yersinia enterocolitica 4/O:3 infections in dogs and cats.Raw pork should not be given to pets.