Dog anatomy?

So I am actually a little confused and figured this was probably the best place im gonna get an answer to it lol. For me it seems like a lot of people pull back the dogs sheath and then suddenly there is the entire dogs cock knot and all. Is that just like speeding up the process or is it once they're hard every part of them is?
 
Oh that makes a little more sense. I was under the assumption it functioned quite similar to how humans do where it's all or nothing not that there were states but thank you for your clarification
 
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You will take great pleasure in exploring how that anatomy works. I was there as a teenager, from the first hand that went to a dogs shealth. It was in lots of ways, mind blowing. Congratulations on your future journey and for being curious and open minded. I cant post porn here, but if you find that "slow mo" video, you can see in quite detail, how the penis enters "small" and then gradually engorges till the point of knotting.
 
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