Females go into heat about every 6 to 7 months depending on the female. They are in heat for a total of 28 days, however will usually only breed for 7 of those days. They are fertile when blood changes from red to pinkish in color. They will usually have their first heat around 8 to 12 months old depending on the dog.
Answered by caroljmcdowell - 5/19/2012 4:59:28 PM