Hey, thought people here might have some suggestions. Bit of context necessary here, I think, so bear with me.
A few years ago my sister and her then-boyfriend picked up a beautiful pup (boxer cross something, never gotten a solid word on what and breeds are not my strong point). As is typical for her, she eventually got tired of it and left it with our mother. Lovely dog, but big, so we tried our best to train him, as he can sometimes do damage while trying to play.
Over the years, he's obviously grown as pups are wont to do, and now he's quite a large dog. He's maintained his playful and lovely nature, but every so often, with no seeming commonality, Conrad (the dog) just goes off and becomes really aggressive. I mean full-ball, teeth flashing claws digging nuts, often attacking our other dog (Sharka, a blue heeler cross, getting on a bit in years). Out of lack of options, my mother finally ended up having to force my sister to take Conrad back: it really was either that, tie Conrad up constantly, or have him put to sleep.
This is a sub-optimal solution for so many problems, but until we can work out what's setting Conrad off we don't really have a choice. Does anyone have any suggestions? He's been desexed and everything, although I think it was a little bit later than the ideal (from what I'm told)?