Will try to keep this short. I adopted our first dog from abroad last year. Things went relatively well and she has settled nicely. She gets on well with other dogs and I always knew we’d get a second, it was just a matter of time. So we stumbled across a puppy, again from abroad, and he came to us 10 days ago. To complicate matters, I also fostered his brother for a week as his first adoption fell through. He’s now gone home but in hindsight, it was a massive mistake to agree to this for various reasons.
Anyway, my existing dog and the new puppy don’t get along as both are resource guarding. I started looking for a behaviourist to help us and now have one booked to come next week. However, she warned me that the dogs are inappropriately matched due to their age (something I didn’t know) and so we’ve been set up to fail. She said I needed to be prepared for this not to work out and got me to think about what I’d do in that scenario - i.e. rehome one of them 
Obviously she’s just being realistic but I’m heartbroken at the thought of it. I love both dogs.
Another issue I’m having is that the new puppy is developing separation anxiety. I go back to work in a couple of weeks and I’m really worried that we won’t be able to leave him at all.
It’s been such a hard couple of weeks, I’ve got the puppy blues and I’m just thinking what the fuck have I done?! I’m such an idiot.