How long are dogs in season for?

Answer 1

The smaller breeds of dogs tend to have their first estrus cycle at an earlier age, while the large and giant breeds of dogs may not come into heat for the first time until they reach eighteen months to two years of age

Answer 2

Dogs are typically in heat, or "in season," for about 2-4 weeks, although this can vary depending on the individual dog. It is important to monitor and keep track of your dog's heat cycle to prevent unwanted pregnancies.