The William boss at end of run when he becomes dog has caused me many problems. He jumps on top of cages so I cannot shoot it.

I lose lots of my time here. Is there way to stop it from jumping?

После изменения формы он будет прыгать, единственный способ стрелять из оружия которые можно направить вверх, можно высчитать траекторию при которой он будет прыгать на одном месте

Not sure whether or not you are using Leon or Claire, but for Leon A. This is the strat you can use that is optimal.

Bogdan, the one way to make him to not jump is... a touch! For example, he attacks you or you just touch him. Any gotten punches or bites (from G3 or G4) make him stay on the floor/ground. So... Btw, this is a one of options how to kill him faster (there are a couple methods).