Nothing in Life is Free Nothing in Life is Free
My advice is to start with this.
Yorkietalkjilly and others gave you some good advice. Consider getting a professional if you can. If you feel overwhelmed or truly worried that they will hurt each other. We can give you general advice, but a in home visit from a professional is better. In your home, we can study body posture, tail, ears, lips, licking, etc.. We can observe and find out what triggers aggression with your dog(s).
We do start retraining with Nothing in Life is Free. We also use time outs, the
Enough Nip which is using the fingers to tap or mimic a bite on the neck. The
Enough Nip only works
before they get teeth on each other, not during a fight. If a real fight happens, you can pick them up by the scruff of the neck, but I have been accidently bitten doing this. I suggest instead picking the aggressive dog up by the back legs. Try to grab them as close to the body as possible, that is less stressful on their knees. I have never been bitten doing this (thirty plus years). Give the cue word Enough, stomp your feet, then grab the back legs and with your thumbs facing you, not the dogs belly and simply lift your arms up toward the sky. Don't pull or drag the dog toward you. When this is done correctly, it looks like a coach calling a touch down. Practice with a pillow, will help make this natural response. Hope this helps, Teresa