So.. What makes the Retriever pup so special? Why can't you rehome it ?
I just brought a pup home a few weeks ago
if the current dogs here reacted in anyway, the pup would be GONE. not the dogs who have lived here for years. not the ones who i have invested all of my heart and time into.
It really isn't that simple. Weeks are not months. The thing is, a bitch is rarely same-sex aggressive to a pack member until that pack member starts to reach sexual maturity. So if you have a pup at 8 weeks old and the problem does not crop up until the pup is 9-12 months old, you are going to be in a quandry about rehoming either dog.
The gut reaction is to re-home the agressor, because let's face it, when you have to separate dogs you care about because they act like they want to KILL each other it is hard. It feels like you are having a heart attack it is fast, terrifying, frustrating, helplessness, adrenalin rush all at once. I can understand why that would make you have second thoughts about having the dog around kids.
But dog-dog, pack-aggression, same-sex aggression is totally a dog thing. And it is just a part of our ability to live with critters, and treat them like critters, understand that they are critters. The dog is not bad, she is a dog. In her workings, there is another bitch who is encroaching / threatening her position there. It has to go (in her opinion). The only way this is dangerous for your kid is if the kid gets in between the two dogs. Which is not impossible.
I would feel responsible for the GSD. And if it was the other way around, the Golden was the elder, I would feel responsible for the Golden. If I had 3 dogs, and brought a fourth and that disturbed the balance that the dogs had, then that would be the dog that would have to be re-homed.