My boy Harley (knock on wood) never been sick, now my little girl Haley has had problems before but seem to be doing fine now. I guess it just might be in there blood line, or a bad breeder. you never know until you take them cute little babies home and spend a fortune in vets bills. cause once you fall in love with them you have to take care of them. I did spend a lot on Haley she had a slit breathing problem but a change in her diet has worked so far.. I still take her for check ups. cause that's just the Mommy coming out in me.