The mutant dog in "Stalker 2: Heart of Chernobyl" is a very troublesome special monster in the game. If you want to fight the mutant dog, you can first shoot some clones and observe the real Psy Dog. Whenever a copy is created, it will glow.
How to fight the mutant dog in STALKER 2: Heart of Chernobyl
If you want to fight a mutant dog, you can shoot some clones first and observe the real Psy Dog, which will glow every time a copy is created. Once you find your target, take it out immediately, let the duplicates disappear, and then the mutant dog will appear, and then you just kill the mutant.