Around six months, but you should never try to breed from a dog at this young age.
You can be seventeen to go in to war.
every 6 to 12 months unless fixed if fixed no more heat and maybe depending on breed age may diminish it
Every kind of dog (female) gets into heat from 6 months of age and then every 6 months. (only if not spayed)
Most larger dog breeds have their first estrus at around 15 months.
Usually between six months and a year old, but it is different for each dog.
Usually dogs come into heat anytime after they are about 6 month of age, their vagina will swell quite a bit, the dog will lick herself a lot, starting with a clear fluid and then blood. If you do not want the dog to go into heat have her spayed at 6 month of age or soon after the first heat.
Yes, when you spay your dog, she can no longer go into heat.
Male dogs can not go into heat.
Yes, my dog is going on 10 years and she goes into heat every 6 months
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I suggest that your dog has been spayed. If your dog has been spayed she will not go into heat.
no its not a set rule, it can go either way... typicaly its around 8 weeks of age is the youngest you would want to buy or sell a puppy.