[Silvester]

Originally posted by Vaiva:

"1. Did not come in heat a all "

That also can have a lot of reasons which have nothing to do with genetical health of bitch - as for example wrong and too less food, sickness by infection or mental stress by low ranking social status in a group of dogs with very dominant or / and much older other bitch.

"2. Were covered but never sucesfull / Did have false pregnancy /Pups were seen on echo but were never born ..."

This also can easily happen without any genetical lack, just by social reasons as i wrote before.
It´s very common and often seen also by female wolves which are living in captivity in a too small area or with too much stress.

Greetings, Silvester