Which preposition to use with bernards

in Occurrences 2%

Then, again, there is no doubt whatever that at some time the Bloodhound has been introduced, and it is known for a certainty that almost all the most celebrated St. Bernards in England at the present time are closely allied to the Mastiff.

with Occurrences 1%

He, in conjunction with Mr. Walmsley, purchased the smooth-coated Kenilworth from Mr. Loft, bred that dog's produce with a brindle Mastiff of high repute, and then crossed back to his St. Bernards with the most successful results.

Which preposition to use with  bernards