Animal testing typically involves injecting chemicals or rubbing directly into purpose-made abrasions or the eyes of animals. It is MUCH more brutal than it sounds.

Im sure they washed dogs with the final formula.

Or they're taking the approach of software companies nowadays: don't test, just make the users test in production

I just had a great mental picture of some scientists chasing down and tackling a wild dog to try and shampoo it.

I always thought this meant "this specific product was not tested on animals but the research it is based on maybe probably involved animal testing." Like there's some foundational knowledge that forms the basis of "how to make a shampoo", and that knowledge may be gotten through some unethical means.