I think some pure breeds, due to their slight inbreeding by design, are going through "inbreeding depression". Probably because some breeds just don't have that

I think some pure breeds, due to their slight inbreeding by design, are going through "inbreeding depression". Probably because some breeds just don't have that large of a gene pool to start with. [0] https://breedingbusiness.com/inbreeding-depression/ https://breedingbusiness.com/inbreeding-depression/