We adopted a beautiful boy rescue cat on Saturday from our local RSPCA. I've wanted a cat for ages, always wanted one as a child but my parents aren't animal people at all and it was always a solid no. The last few years I've always loved playing and cuddling other relatives cats and now I've moved in with my boyfriend we decided to adopt a little 2 year old fella who needed a home as he'd been abandoned. OH as always had cats at home since he was little so is fine with all the practical side of owning a cat.
He did really well on the first day, hid for a couple of hours under the sofa but eventually came out to see us and ate and drank well. Used his litter tray and even sat on the sofa and had snuggles with us. I was in love!
He's now been here 4 days and I'm starting to feel a little concerned. He has massively long claws which I'm assuming are normal as the rspca didn't clip them or anything but they are razor sharp. Bought him a nice fancy scratching post which of course he doesn't use
but I'm not surprised.
If he's sat on the sofa with you (which is pretty much all the time if you're sat down) he'll follow us when we get up. This isnt a problem but he dances round my legs and a couple of times when ive moved he's grabbed my legs and clawed drawing blood 
Also he'll come and snuggle up on my bed right up to me which again is lovely, but then he rolls over which appears playful but if I move at the wrong moment he goes for a bite 
My mums friend came round the other day and she was stroking him which he appeared to love, next minute he bit her.
I'm more than happy to have a cat that would rather be left alone and if he doesn't want fuss all the time that's fine. But it's him that's initiating it all the time, wanting to sit on me but then claws 
OH says he's just being a cat and that's how they are but then did admit none of his other cats have bitten... I don't really like the idea of a cat that I can't trust when people are round, especially when he demands fuss then reacts badly. I don't think he means it at all, I'm getting the impression he's had a bad start to his little life as he's very nervous about other things too. If ever he hears a dog bark he looks very startled, and next door put her bin out the other night and the sound of it being wheeled out terrified him.
I know he needs time to adjust, our house is lovely and quiet and normally someone around for a decent part of the day so I thought this would be good for a cat. But when should I be worried about biting and is there anything I can be doing in the meantime to avoid it?
Thanks
Worried new cat owner 