I can get my dog to knot and be hard but he never thrusts or cums?

A dog will begin to cum pretty much as soon as the erection happens.
The first fraction is clear, the second fraction is milk colored and contains sperm and the last fraction is again clear.

What do you mean by he is not cumming?
Is he neutered?
Is there no liquid coming out of the penis? If so, then this might be a reason to visit a vet.
 
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