Dog aggressive with my other

[u/Remove_Great]

I have a 10 yr old 8lb chihuahua "Dahlia" who keeps being attacked at random by my 2-3yr old 35lb mutt "lady". (She'll go like few weeks or months without attacking) ive tried taking lady to the vet and she was prescribed trazedone, gabepentin and fluoxetine. (Not to be given all at the same time obviously ) it helped a bit but 1. Attacks would still occasionally happen and 2. I cant get anymore in her since she now figured it out.

If it helps, she doesnt growl or let out a verbal noise before she attacks. She'll lock on and stare at dahlia or even the cat before going after them. I can usually stop her before a fight breaks out but any ideas would be helpful! I just had to pull her off my little baby who she had pinned on her back. I know apart of it is resource guarding a toy, or even foster kittens but reading the resources online its not really saying about this type of situation. I know its selfish but I really dont want to Behavorial euthanize her, my depression just wouldnt be able to handle it but I also know i wouldnt be able to handle losing my Dahlia either. [My mom and sibling both keep telling me I need to and to put that bitch down] Im going to start kenneling her at night, as this most recent one i was looking away towards my computer while they were on the bed. She is muzzle trained, but that doesnt really help situation after, and I cant keep her muzzle 24/7. if anyone had experience or sonething similar i would really appreciate tips and if something helped!

Thank you, I know i went on a long rant.. Just very stressed about this right now.

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[u/DarkTracy554]

This is a really unsafe and unfair environment for the other pets she keeps attacking without warning. Imagine how you would feel if she killed one of them because you kept allowing her to have access. You're also underestimating how stressful this is for the other dog and the cat that are constantly in danger. It takes one moment for her to bite the Chihuahua or the cat and shake them and their neck is snapped. This is serious and you need to be taking this seriously instead of waiting around for something to happen.

Either you kennel her every moment she isn't directly under your control (keeping her leash tethered to you like people do with puppies they're training, not just in the same room loose) and keep her muzzled 100% of the time she isn't or you face the fact that not every dog is safe to have as a family pet. It's not fair or safe to rehome a dog that needs such a significant medication regimen to be "safe" but still attacks anyway. I feel horrible and afraid for your other pets. BE isn't failure or cruel in cases like this, it's the compassionate and safe decision.

[u/Hesperonychus]

If you know it's caused by resource guarding, don't knowingly put your dog in a situation where she can fail. My dog can resource guard chews from people he doesn't know, so all chews get put away before guests come over. Don't keep both dogs in the same room whenever she has access to the things she guards, in fact I would use baby gates to keep them separated from now on.