[drawlins27]

I can't believe no one has brought this up yet. I agree that Health screening is important but that doesn't catch whether or not they are a carrier of congenital defects.

For some things you just need to know the line they are coming from. For example, your female may not have liver shunt but she may very well be a carrier and there is currently no way to test for that so you would need to be very familiar with the line she came from. She could also tend to throw open fonts, again no way to test for this.

Knowing their line is just as important as health screening. Again, it all comes down to knowing the breeder you get them from (if they have not come from your own line).