A few things to think about:
Video files are big, very big, think about this because trying to load and edit a dozen 20minute clips will be hard work, so keep your clips short.
In a finished video a lot of clips might only be 2-3 seconds long, 10-15 seconds is quite a long clip.
The problem with animals is they will often do nothing then once you have pressed the stop button they spring into life! So shoot lots of small clips, but start recording again asap, think of watching a Heron sat at the edge of the water looking for prey, it does nothing then suddenly springs into action, how long would you have to film to get that shot? You might shoot for 10-15mins and get 3-4 seconds of action, stop/start would break that down into 1 minute clips which are more managable.
To stop the video looking too choppy create a story, film the whole walk and break in down in editing. What makes a choppy look is when it jumps from one point to another without showing (even just briefly) the journey to get from point A to B.
Example: The dog getting out the car followed by the dog jumping in the sea which is half a mile away would give a choppy look. The dog getting out the car, its lead being put on, you both walk away, a shot of the area your walking through, more shots of the walk with the dog or both of you in it, arriving at the beach, the lead being taken off, the dog running towards the sea, then the dog jumping in the sea, coming out, shaking itself, running along the beach........................ the more shots you get that tell the story the less choppy it will look.
You'll need a tripod and have to walk back and forwards a few times to get the shots but the finished video will be something you'll enjoy watching and tells a story much better than random clips put together.
Film the dog from different angles, film from low down a lot to give the dogs point of view, get wide shots showing the surroundings, get medium shots, get close up shots where the dog fills the frame, and also extreme close ups.
Its all really how much effort you want to put in, the more clips and variety of clips you get the better the finished film will be, it will take time but your dog will love it as their normal 1hr walk will now take 2-3hrs
When you edit, watch each clip, is there something of interest in each clip? You might find that in a 1 minute clips there is a 3 second interesting bit, use that cut the rest.
And try not to zoom in and out, it looks really bad, same for fast panning.
I might be wrong but the R7 will shoot 4K at 60fps and 1080 at 100fps. Shooting at 60fps will only give you just over half speed for slow motion, where 100fps will give you a quarter speed clip.
If you are going to shoot slow-mo then just make sure its a good scene, running through water looks great, if your dog is well trained lie down on the floor with your wife behind you calling the dog so it runs to her and jumps over you, that will look good in normal speed or even better in slow-mo.
I did see a clip recently where the camera was on a long selfie stick (or monopod) and there was cheese hanging from the front of the camera and it was moved just quick enough to stop the dog from grabbing the cheese, looked great in slow-mo.
Take lots of small clips 30sec to 1 min, expect to come home with an hours footage which will make a fairly good 5min video, yes you will delete that much.
