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www.petcha.com/what-to-expect-with-a-young-dog-in-heat

The exact time a young dog has her first heat varies by breed and individual, but small and toy breed dogs tend to have it sooner. Tara Darling/I-5 Publishing.

www.akc.org/content/dog-care/articles/when-dogs-in-heat

Jul 30, 2015 ... Although six months old is the average age of a dog's first heat, this can vary widely. Some dogs can go into heat as young as four months, ...

pets.webmd.com/dogs/how-tell-if-dogs-heat

First estrus generally occurs when an unspayed female dog is between six and 24 ...

www.vetwest.com.au/pet-library/reproduction-in-dogs-season-heat-oestrus-pregnancy-tests

How often do female dogs come into heat? ... The smaller breeds tend to go into oestrus or "heat" earlier and some females can have their first "heat" cycle as ...

www.canidae.com/blog/2010/07/how-to-care-for-female-dog-in-heat

Jul 8, 2010 ... Female dogs that are not spayed go into season or into heat ... My dog (7 months ) is going through her first heat at the moment and yes, she's ...

dogs.lovetoknow.com/wiki/Dog_Heat_Symptoms

To better understand the many symptoms of the dog heat cycle, it's best to ... According to DogBreedInfo.com, the first sign that the dog is going into heat is the .... my dog is one year old and is on her second season, she has stoped spoting a  ...

www.pet-happy.com/symptoms-of-a-female-dog-in-heat

Sep 6, 2013 ... First symptoms of a dog in heat is usually bloody discharge from the vulva. Is your dog in heat? Not only is it helpful to recognize the beginning ...

www.thelabradorsite.com/dog-in-heat

Your dog's first heat. Unless she is neutered at a very young age, your dog will have at least one season in her life, and ...

www.dogbreedinfo.com/breedingheat.htm

Dog Reproduction, The Heat Cycle, Signs of Heat, Whelping and Raising ... The first sign of a female (dam) coming "into season" is often swelling of the vulva.

vcahospitals.com/know-your-pet/estrus-cycles-in-dogs

May 16, 2011 ... Dogs will have their first estrus cycle when they reach puberty. Estrus is ... sometimes a dog that is in estrus is said to be "in heat" or "in season".