Kinda Sad; Guilty

[Tempus]

There's a limit to what can be expected of anyone. I've had dogs my whole life as have most of my family and friends and I've seen dogs sent to the adoption groups and the "pound" for a lot less in a much shorter time. Sometimes you run across a dog that is just unstable, often for physical reasons just like some people. I think you did a kind thing taking in that dog in the first place and then you went above and beyond by trying to care for it for so long. Good on ya' mate!

P.S. protecting the demeanor of your lab is more important in the long run than anything you could do for your Mom's dog.