When does a Cairn Terrier go into heat?

Answer by  outlaw (177)

Your dog probably will go into heat between 6 and 9 months of age. The heat cycle lasts approximately 21 days. Most females have regular cycles approximately every 6 to 8 months

Answer by  Erica95 (323)

All dogs generally go into their first heat cycle at around four to six months of age. It is harder to determine when a smaller dog goes into heat so be observant of her around this time to make sure that there isn't any bloody discharge to signal it.