Cool, welcome from out behind the curtain. 
The two key advantages to RovyVon Aurora flashlights is that they’re amazingly bright for such a small size and have a rather unusual mix of features. They do make larger ones where the battery can be removed and changed out.
Frankly, since you need to walk outside at night a lot with a dog & probably other things like baggies, why not get yourself a headlamp? You just strap it on and go. Alternatively, you can get a headlamp with a rear clip to affix to your jacket front… A headlamp frees up both hands, which can be VERY valuable when you’re dealing with a powerful dog!
There are so many choices available these days, at different price points. You can get neutral-white and warm emitters. Different battery cells. It’s worth investing in a good quality flashlight that will last you for many, many years. Maybe get one that takes AA or 14500 cells, with built-in charging. Even 18350 cells can be a good alternative, keeping the light small (although appreciably thicker).