http://jfoodprotection.org/doi/pdf/10.4315/0362-028X-40.5.317?code=FOPR-site (this document lists a couple of serovars and their direct affiliations with dogs, but they are interspersed and not, therefore, copied here). The magnitude of this reservoir may be considerable; a survey conducted by Galton et at. (4) revealed 27.6% of 8,157 rectal swabs, collected from dogs, were positive for Salmonella. Dogs, on occasion, have been observed to eat carrion and garbage and to practice coprophagy. Therefore, the mechanism for transmission of Salmonella to dogs, and re-infection among dogs, may be present continually.