11mths is far to young,around 2yrs old is best.It all depends on the breed,smaller dogs tend to come into season earlier,anytime from now,but she could be over a year before she has a season.my old boss had a cocker who was 2yr 7mths before she had her first season.

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My name is Niccie and i work in rescue
National Animal Welfare Trust

Fudge,my American Cocker Spaniel