i had two whippets from the same breeder but with 12months age difference then brought a patterdale 12 months later all was fine until the younger whippet turned 1 then he tried to kill the other whippet(all male dogs)ended up having to get rid of younger whippet and pay a hefty vets bill.Just have the 1 whippet and patterdale and they are inseperable and work well as a team.dont listen to people who tell you whippets are to soft mine hasn't missed a nights hunting even with all this snow just make sure its from good working stock.good luck