Is my anxious dog destined to be a single dog?
My resident dog (4 years old, likely a poorly-bred BYB lab with missed developmental periods; we rescued her 3 years ago) is anxious, doesn't read or give normal dog social cues, and has never play bowed in her life. Lots of work has gotten her more confident, but she's just odd socially.
We're fostering-to-adopt a second dog, specifically chosen for being submissive and great at reading cues. He's wonderful, and we deliberately did slow intros (parallel walks, scent swaps, neutral meet-and-greets) before bringing him home. Indoors they're separated by a baby gate and coexisting peacefully.
Yesterday in our fenced yard, off-leash, my resident dog got the zoomies and started doing this weird "fake-out" movement she does instead of play bowing, clearly trying to invite play. They ended up chasing each other. When he mouthed her mid-chase, she barked and bared teeth at him. He backed off but looked confused, and she kept doing the fake-out thing while tucking her tail and skittering away like she still wanted to engage but couldn't handle it. We separated them at that point.
He wasn't being pushy. It really seems like she wants to play, gets overstimulated the second it becomes reciprocal/two-sided, and doesn't have the skills to communicate "too much" without snapping.
I don't want to build a negative association between them, and I don't want him getting corrected constantly for normal dog behavior, but I also can't supervise every second once the gate comes down permanently.
For context, it is day 3 of having him with us. I really love this dog already. He is so fun and goofy. He makes me laugh constantly. The idea of having to return him because of my neurotic first dog brings me to tears. I want this to work and I want to be his forever home, but I also want to be realistic. Is this going to be sustainable long-term as we go through milestones like getting a new house, getting married, having kids potentially, etc. This is my greatest fear.
I feel like we are doing everything right and being extremely cautious and trying to keep everything positive, but despite everything, it's like the effort doesn't matter.
As I mentioned, we suspect that Resident Dog missed a critical social development period in her puppyhood as she does not seem to know how interact / socialize with dogs properly, cannot read their non-threatening body language, and does not understand what a play bow is.
Has anyone dealt with this pattern (anxious/under-socialized resident dog + confident newcomer)? Is this workable with time, or a sign it's not going to click?
TLDR: My resident dog has poor social skills from likely bad early development and doesn't play-signal normally. Our foster dog (great social skills, low-key temperament) tried to play with her off-leash and she snapped when the chase got two-sided, even though she seemed to want to play. Looking for advice/success stories on integrating an anxious, poorly-socialized dog with a confident one.