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Great to see this informative project and I think its the best idea in this field just like I am working on onlydoodles project and its also very unique.

Its looking very modern speedometer in the video I am also I am also working on a dog fences website project so we both are in the same field.

Video uploaded!

The dog seems to me like a very sweet dog. I hope she got an extra dog snack for the project input ;) Nice project. It is a simple and good solution to use the x offset of the LEDs, but you can also use an Inertial Measurement Unit for the motion/speed sensor (eg BMX055/BNO055, there are arduino libraries available) and LEDs with the same x offset. The IMU gives you the speed, with the speed you can determine the flashing frequency of the LEDs and with the LEDs you can display the speed. You can also measure the acceleration, etc.

Yes, and she liked the attention, even though she did not like the harness.... There are many ways to measure speed, I was initially thinking of doing audio doppler, photosensor trap or something with a gps. This was just a really unusual way of doing it and an interesting challenge with almost no hardware.

Hi, just for me to understand. Technically its just blinking LEDs that are distorted depending on how fast your dog is running? I really like the simplicity and the idea!

Yes, that's exactly it. I've got the video showing it in action shot, just need to edit. It's surprisingly difficult to catch the effect on a videocamera. Took about 30 tries :D

No sensor needed, that's the trick of it! The flashing sequence stays exactly the same, but because of the arrow shape of the row of LEDs, it skews differently when it's moving at different speeds. That's what I tried to convey in the GIF with the arrows in the blogpost. I've taken some video today showing it in action on a rotating platform, still need to trim/edit and upload.

Alright, I really want to build this for my dog.  My question is, how does the Arduino determine the speed?  Doesn't it need some kind of sensor?

Egh, I created another comment instead of replying, just pinging here so you notice :)