I honestly think it is the most rewarding thing in the world to have a dog with "issues" trust you. BRX laughs at me when I ask for the difficult ones to foster!
The hardest one was Dougal. He was originally offered on Facebook, to an uproar! Most thought, because he has shown aggression, AND bitten a child, he should be put down.It was horrible, a vet plus 2 behaviourists advised he should be euthanised. We had that dear boy for a month, and he was the only foster that made @Mr.Beanwood cry when he left...out he gets emotional at all of them, but those two were joined at the hip, literally!
He went eventually to a lovely man with PTSD, and they both are very happy. One blip when he took him to a home with 2 dogs and just let them sort it out, but well we all make mistakes and no-one or dog was hurt.
I usually get some sort of history, with Casper it was sad, handwritten note, ( I still have it) and most make some kind of sense, and in some part relate to the dog in front of me. Where they highlight what they think is a serious problem, and most have, after all, it would be the reason for giving the dog up... it has always been fairly manageable with a plan in place, and a bit of consistency.
Work with the dog in front of you, but plan for the worst, and you will fine
