Bold: Pure speculation on your part. I already told you, your opinion is irrelevant here. Cerberus grows new parts when he's atacked, thus if he gets an acid atack, he does the same.

at you saying the acid "disolves" the dog. Lmao really, where did you get that from? First of all katsuyu can't throw that much acid at once to disolve the dog, and second of all, there's no implication the acid can disolve the dog. Boulders are fodder on NV, cerberus tanked Odama rasengan.
Cerberus gets the acid and regenerates.
Needed tu use a rock to move around it? Not happening with Cerberus, which is a different animal, and has amazing
jumping feats, while manda dodged it while being stick on the floor, since he's a snake, and cerberus is a dog.
Already told you, Cerberus wouldn't be the only one atacking Katsuyu. And the only thing cerberus needs here is to take on Tsunade, not katsuyu. Did you forget what we were debating? Cerberus only needs to survive Katsuyu's atacks and keep her bussy so pain can roflstomp tsunade. Once tsunade is dead bye bye katsuyu. (Deva sends katsuyu flying with shinra tensei like he did to the frogs).
Tsunade gets stomped. Katsuyu's acid gets tanked, and cerberus reaches his goal, which is to avoid that Katsuya helps Tsunade in the battle against pain.