Asguard,
Why can't you look this up? I'm not a vet! Form this site:
http://www.vetmed.lsu.edu/eiltslotus/Theriogenology-5361/the_normal_canine.htm
It describes bleeding is simply blood lost because the uterine lining (endometrium) become leaky (diapedesis) just before the "estrus phase", it is not from the destruction of the uterine lining which occurs during the "diestrus" phase, it describes no bleeding during "diestrus" but repair to the endometrium occurs during "anestrus" phase.
Why can't you look this up? I'm not a vet! Form this site:
http://www.vetmed.lsu.edu/eiltslotus/Theriogenology-5361/the_normal_canine.htm
It describes bleeding is simply blood lost because the uterine lining (endometrium) become leaky (diapedesis) just before the "estrus phase", it is not from the destruction of the uterine lining which occurs during the "diestrus" phase, it describes no bleeding during "diestrus" but repair to the endometrium occurs during "anestrus" phase.