"This doesn’t mean dogs necessarily understand physics, with its complex calculations. But it does suggest that dogs have an implicit understanding of their physical environment."

The same as humans. When we want to solve most physical problems we need mathematical formulas and a lot of theoretical knowledge, and we generally have very little common sense what's going on there. Some questions like e.g. "why are there swirls in water" or "why do magnets work" seem interesting and there are no intuitive answers but only mathematical equations.

But to solve less sophisticated problems based on Newton physics what we really need is often only general mathematical knowledge and pure common sense. And questions like e.g. "why is it more difficult to accelerate heavy object than light object" or "why do objects after collision move in opposite directions" generally seem boring because we think about it as something obvious and intuitive.