hi, thank you for your response. i have all my dogs tested, also father of my litter is, and pupps will be sold with test already done 

 i was just wandering and wanted to know bit more about this, since i dont know any DM/DM dogs here and so noone can tell me bit more how it is in reality. i know, that also a dm/dm dog must not be ill and can live a long time without problems... 
again, sorry for your lost.