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Maybe case 5 or 6 with dog changing direction quickly and accelerating and stopping quickly. I usually set tracking sensitivity to -1, have so far have used focus priority but I'm about to give equal priority a go. Canon says it shouldn't make a lot of difference, just will affect your frame rate, you may not get 6fps.
Here's part of a message I sent to someone asking me about setting up my 5D III. Not sure if it's of use but it may give you some ideas.
The basic idea is to use C1, C2 mode dial to store a configuration for action work that you have immediate access to.
I use Tv 1/2000, Auto ISO (with maximum of ISO 6400). I use AI servo, with high speed continuous drive. I only use x-type points for selection. I have set the * button to use centre point with 4 expanded points and have set the AF-ON button to use a registered point with spot AF.
I have set my default AF case as number 2, this sets the tracking sensitivity at -1 giving the AF more time if your chosen AF point falls off the subject before it tries to focus background.
I have also set the DOF button so that when I push it it switches the AF to centre point with 8 expansion points, and sets the AF accel/decel to +1 and AF pt switching sped to +1. I would push the DOF button and use these settings say when I was saying trying to shoot a more errartic, faster moving bird that I would be with my normal settings. This saves me having to dive into the menu to fix things. Also by having all of this on C1, it means when I'm doing landscape work If I revert back to Av mode, my DoF button is just a normal DoF button and I only use it for AF setting changing when in action mode on C1.
I have also made a variation of these settings for C2 where the DoF button allows siwtching between AI servo and One shot -great if the bird stops, so I can automatically switch to One shot and spot AF for pin point AF. I have yet to decide how to program C3, but that will be for landscape. These settings are a work in progress so they may change depending on my success or not. However, I have found even case 1 does a damn good job fro BIF such as eagles, herons, etc that don't move erratically. Haven't tried it on swallows yet, but that's where I think my DoF button settings will come in handy. The nice thing about using C1-C3 is say you find that a different setting works better you can choose to allow the C1-C3 settings to auto update so that setting is automatically now saved.
I highly recommend going to chapter 13 of the manual as you can configure these things in so many ways
I hope I haven't confused you and feel free to ask any me anything if I can help.
Bottom line start on AF case 1 and tweak from there, but I think setting up custom settings like I have for action work will save you a lot of time as you are set to go just by turning the mode dial.