By knowing the ovulation date, optimum breeding dates can be obtained. (eastcentralvet.com)
It is important to remember that, in the bitch, the critical timing events occur 4 to 6 days before the optimal breeding dates. (oldenglishsheepdogclubofamerica.org)
Swedish Vallhund, often called the Viking dog, is a very old breed dating back as far as 1,000 years. (dogbreedstandards.com)