- When someone knocks on the door, she barks for about a minute (although in the last month this has decreased considerably).
Completely normal tbh
- She gets upset when DP and other DDog (or DDog and I) leave for a walk, even though she's with the person left with her.
Pretty normal I think. Perhaps it's a case of not knowing what is happening / a bit of FOMO? I would try and set up a signal so that she understands what is going to happen - for instance, a particular chew appears, you say a specific phrase such as "see you later girl, back soon" and then exit.
- When meeting new people, she stays incredibly close to DP or I and tries to hide. After two meetings with that person, she switches completely into the cuddly sook we know her to be.
Pretty normal for a dog that's a bit worried. Mine takes a lot more than two meetings to start liking someone - I've had him 4.5 years and he's only started saying hello to my DM in the last few months...! Admittedly she doesn't really put the effort in, but...
Try not to force things too much but if, for instance, a visitor was to throw a ball for a dog that likes to play fetch, it would be a nice non-forced way to interact.
- She's terrified of cars. Absolutely terrified. A year on we're still having issues getting her in which is not ideal.
This is the most problematic - though how problematic it is will depend on your lifestyle. If you're in an urban area it'll be paralysing but if you're on a farm at the top of a mountain then it may barely be noticeable.
This is the one thing where I'd recommend contacting a APBC / CCAB / ABTC qualified behaviourist for help if it's causing issues.
Most things in dogs are only really issues if you think they are because they're incompatible with your life. For instance, barking at the doorbell is quite normal but might create a problem if you work nights and are often asleep when visitors call. But if that was the case I'd recommend one of those Ring doorbells that sends a notification to your phone instead of proper training...