Mine is also around 6.5 kilo as well so not a tiny delicate little thing.
She was an absolute dream as a puppy. The breeder did have her crate trained and had already started on house training when I got her so night time sleeping and house training were both very easy.
She (breeder) had also started on a bit of socializing, as in getting her friends and their DCs round to meet the puppies, as a consequence she loves people and is very friendly.
Not so keen on other dogs, no issues, just not really interested in them, although she will occasionally meet another dog she wants to play with.
Absolutely no issues with separation anxiety but the other side of that is that she can be quite independent and although likes to be groomed and stroked, doesn't cuddle and won't sit on my lap for more than a couple of minutes.
Was never a chewer of random things.
Got on well with my two cats but very wary of strange cats.
Likes to retrieve her ball and was a bit ball obsessed when younger but that's changed now she's a bit older. She's always loved to learn things and really enjoyed training and the praise she got for it. She's a bit of a show off tbh and loves to demonstrate to anyone who'll watch how she can jump for her ball.
She was however, a bugger about recall when she hit adolescence and decided she wasn't going to get back on the lead. But we worked hard on that and her recall is fantastic.
The biggest drawback is the barking, but I've worked on that and she is allowed to 'have her say' and knows to stop when told.
The main thing is to remember that just because it's a small dog it doesn't mean you can get away without training it in exactly the same way you would train a large dog. And just because it's small doesn't mean it should be allowed to jump up at people.
I don't get her beautiful long coat clipped - although her paws get hairy and need to be clipped regularly - I brush her a couple of times a week, and the only time I've bathed her was when fox poo was involved.
Teeth can be a problem, as it can for most small dogs so you need to clean the teeth regularly, with dog toothpaste obviously, so need to get a puppy used to that when small.
Treat your pom like a proper dog, train it properly and you'll have a lovely dog.