I couldn't let it go. So I started researching.
I found a holistic vet who finally explained what the others never mentioned.
Vets are trained to treat confirmed infections. If the stool test doesn't show eggs or adult worms, they have nothing to treat. So they wait.
The problem? Parasites don't appear overnight.
The stool test can be "clean" for weeks — even months — while parasites are quietly multiplying inside your dog. By the time worms show up in the test, the damage is already done.
That's not negligence. That's how the system works. And it leaves you in the middle, watching your dog suffer, with nothing to do but wait.