Its a feature of alfas but this is the first omegaverse i have seen it in xd
If you consider where it comes from...
It always in the first description of alpha.they can knotted.
Been wondering if there is really author use the feature sooo.. this is the first time i saw in manga!
Its way more common in fanfics, but it's because omegaverse is in its base based on (or at least i think it is) the dynamic many think wolves have (which they dont btw). And the dude wolves have knotts, which results in that some omegaverse storys/worlds do "use" them and others do not (a decision made in taste probably). But in short, yes alphas (and betas and omegas) are kind of canines ^-^
Knotted, so, alphas are now canines?