We recently rescued an 8-month-old female who's become aggressive and has attacked our other female. Is something like this possible to fix?

Perhaps you could give some very desperate owners some advice on how to handle this?

We have three rescue dogs two about twelve; male and female one recently rescued about 8 months old a female just over her first heat. She became very aggressive with the older female, she has established her dominance but still there has been several attacks and the last few were bloody ones and harmful to the older female.

Is something like this possible to fix and how? We're planning to have her spayed will that help?

Our vet said to separate them and that the spaying probably won't help the situation. Another professional dog trainer said to beat her if that doesn't help get rid of her and our dog trainer said to spray pepper mace in her face. These are all very old school, we don't beat our dogs.

I'm looking for an answer, getting rid of a dog is something we don't won't to do that's the soul purpose of rescuing these animals.>

Thank you in advance for any help!

Barbaranne