My dog is very aggressive?

My dog is extremely dog aggressive. i don t know what to do anymore. i adopted her last year in October and I ve contemplated taking her back, but i just cant bring myself to do so because i can see in her eyes how much she loves me. She is a few months over a year old and shes an American staffordshire terrier.... show more My dog is extremely dog aggressive. i don t know what to do anymore. i adopted her last year in October and I ve contemplated taking her back, but i just cant bring myself to do so because i can see in her eyes how much she loves me. She is a few months over a year old and shes an American staffordshire terrier. personal training is not an option because i can not afford it. I need training tips and guidance. Thank you all for your responses in advance.
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