+ there is a chance that having sex in prime heat could lead to a higher risk of false pregnancy for a female dog
https://www.zoovilleforum.net/threads/mastiff-cookie-in-heat-pics.85482/#post-2115833Do you have some more detailed information about this and maybe a source?
I think there is no connection.I can't find something about a relation between sex and false pregnacy in there...
No. Size of the breasts is bigger, but in general temporarily.Can a false pregnancy after the first heat affect the physical development (especially of the sexual organs, of course)?