Bolting a dockbuilder ulf and bolting an ulf right off is the same, Shanks. Remember that in order to bolt an ulf you need to have LOS on him. By the time your scout has found his ulf he should already be busy making a dock.
However, this is why any decent Norse double ulfs vs Zeus, using both ulfens to make his initial dock. You can try to bolt one and harass the other with your scout, but I find that unless the map is Highland and Zeus' scout is extremely lucky to find the ulfs so early, the dock can be completed first. If anything, the dock will be very close to completion, so the remaining ulf can complete it despite the scout harassment by dancing samba on the right mouse button.
A surefire way would be enclosing both dockbuilder ulfs by an incomplete wall, but this is too much of an effort for too little gain IMHO.
Agiyr, I figure the reason you were so successful with your bolt vs that CPU is the following:
The CPU followed its usual buildup script, planning to make a new house when it is running low on pop. Since you bolted its dockbuilder ulf, it ran completely out of pop. It probably reacted by ordering a new ulf, but this ulf could never spawn due to lack of pop, so the CPU remained at 15 pop for the rest of the game, effectively being jammed. In other words, you exploited an AI script weakness without being aware. This should make it pretty obvious that this kind of success is not even nearly to be expected against a human player. Humans usually make the first house earlier and at a better location, and even if they do not, the least thing they would do is converting a vill and completing the house
(although that alone would already mean a big drawback).
Contradicting what others said above, I would like to emphasize that it normally does not pay to bolt an ulf unless you catch him building a dock or temple alone (or early enough so that you can prevent the dock/temple by harassing the other ulf). I always laugh at players that randomly bolt my scouting ulf when they see it. Replacing that ulf is not much effort even in archaic age, and that bolt power could have hurt me much more later on. Good players usually use the bolt power to bolt the free enemy myth unit when they are playing vs gods that cannot get Son of Osiris or Nidhogg. Bolting the enemy free valkyrie is much more effective than bolting a scouting ulf. Most Norses - including me - usually get another ulf before advancing to classical anyway.
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Valor is the contempt of Death and Pain. (Tacitus)
Problems worthy of attack prove their worth by hitting back. (Piet Hein)