Soft grunting.

Hello everyone, new rabbit owners here.

About 3 days ago my girlfriend and I adopted a rehomed English spot mix male of about a year old.

So far he has been the sweetest little thing, so far he has graced us with a lot of flops and he becomes exited when he sees us and will run to us.

One thing I have noticed is that he makes a lot of small grunts, I almost can't hear it. By a lot I mean all most all the time, like when he is exploring our home but also when he runs to us, he will circle our feet and do the soft grunts.

I'm pretty new to all this, but I see nothing that I think would indicate aggressiveness. He has no raised tale or pinned back ears. If anything he seems exited. Even if I walk away he will just follow me.

Do you guys think he just grunts a lot or is it aggressive behavior?