When does a dog have a second heat Dogs have a second heat time

When does a dog come into heat for the second time Dogs will come into heat for the second time around 14 months. Dogs come into heat for the first time at about 8 months of age, and then they come into heat a second time at six-month intervals. Sexually mature dogs come into heat twice a year. Spring estrus occurs from March to May and fall estrus occurs from September to November, with an interval of about 6 months between estrus. In the case of female dogs, estrus is marked by vaginal bleeding in the bitch. Dogs in heat become more aggressive, territorial, want to run out of the house, and are sometimes anxious and restless. If there is no need to breed, it is recommended that dogs be spayed to avoid loss and reproductive diseases.