To add to the point above: I honestly disagree that the kit lens is the move here. In my experience, shooting a moving dog requires a wider aperture to keep your shutter speed high enough to freeze motion without cranking your ISO into oblivion. The kit lens is way too slow for that. TL;DR: Grab the Canon RF 50mm F1.8 STM instead. I used that glass for years on my mirrorless setup. It is sharp, light, and that f/1.8 aperture is a game changer for low light or getting that blurred background look. It will save you a ton of cash too. Quick tip: Switch your R8 to servo autofocus mode and keep the dog in the center of the frame. You will see way more keepers than with the kit zoom.

^ This. Also, I honestly had some issues with the entry-level options when I first started moving into the R system. I picked up the Canon RF 50mm f/1.8 STM thinking it would be the ultimate budget fix, but unfortunately, the autofocus hunt was not as good as expected when trying to track a fast dog. It’s a sharp little lens for portraits, sure, but for active pets, the reliability just wasn't there for me personally. You might want to save a bit more or look for a used Canon RF 85mm f/2 Macro IS STM if you can find one near your budget, as that extra reach helps keep distance without losing the focus speed. Just be careful with buying gear that ends up sitting on a shelf because it missed the shot too many times.

Congrats on the new camera, that R8 is a sweet piece of gear. Honestly, dont worry about being lost, weve all been there and it takes time to get the hang of things. Since you want to shoot your dog running around at the park, my biggest piece of advice is to stay away from the super cheap manual focus lenses you see online. They look tempting because the price tag is low, but trying to track a moving pup with manual focus is a total nightmare. You will end up with a hundred blurry shots and a very frustrated dog. I really think you should stick with lenses that have fast autofocus. The kit lens is actually pretty decent for starting out, it covers the basics well and keeps you within that budget comfortably. It works well for those sunny park days when you have plenty of light. Just be careful not to drop it or get it covered in sand since the entry-level ones dont always have the best weather sealing. I have been using my starter glass for a while now and honestly, I am still satisfied with the results. Just take your time, keep the shutter speed high so you can freeze that pup in motion, and dont rush into buying a massive collection of lenses right away. You will be just fine.