Hi probably a silly question.ive been offered 2 year old saint bernard dog for the fraction of the price you would normanly pay,the owner is moving and can't take the dog with them.the question is the dogs eyes are different colours and when I ask for a look at the papers off the owner he says there in the house somewere and can't find them.are trhe eyes an indacation that its not a full breed or could have been interbread,thanks in advance for your replys