I wouldn't neccessarily not believe it. Unfortunately people do keep dogs for two years, or even longer and then dump them on the streets/sell them/suddenly start neglecting them/kill them. Just 'cause they get bored.
I was reading it like this was a concerned friend or maybe ex girlfriend of the owner, not the owner himself.
It could be a scam. I hope it is. But it also might not be.
The RSPCA won't be interested.