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Anyways, as the title suggests, things have not been going great. The new dog Daisy is overly aggressive towards Scarface (not in that she wants to fight, but she wants to play with/be around Scarface as often as she can), however Scarface wants absolutely nothing to do with Daisy. In fact Scarface seems scared of Daisy and will leave when Daisy comes near even if Scarface was somewhere she wanted to be.
When all of this happens, my sister makes things 10 times worse by yelling at Daisy for scaring scarface, but of course Daisy doesn't realize what she is doing is wrong (in fact, it isn't wrong, scarface is just being a wuss, but scarface is more important than a new dog imo, since we have had her for ten years) and so Daisy doesn't know why she is being scolded and therefore has no idea how to react.
Also, both dogs were heavily abused/neglected by previous owners, so they both have odd behaviors/phobias that you just have to get used to when you adopt abused dogs, but those are manageable, I just want them to get along with each other.
Another piece of information that I find pertinent is that my sister did the same thing a few years ago, but that dog was violently aggressive with Scarface and so had to be given back to the humane society. (she has since found a happy home with people a few blocks away from us) Not sure if that matters, but just so you know that scarface has unsuccessfully been introduced to a new dog in the past.
Basically I am asking anybody that has dealt with a similar problem or is an expert on dog behavior what I can do to make this work. I really don't want to have my sister send Daisy back because she has enough health problems that nobody will want to make the investment to get her healthy again, so if she goes back to the humane society she will most likely be put down.
Any websites I should visit, or just advice would be greatly appreciated.