Yes, one female can bring another female into Season. It seems around this house it's never ending....one, then another, then another...
Having the spayed could stop the aggression, it's never a guarantee. I have 2 females that are pets, spayed before they ever came into Season.....however, the still fight. Never know when one will tick off the other. I've had to break up fights in the middle of the night just because one got too close to me on the bed........
__________________ Mardelin Yorkshire Terriers |