Absolutely true. I've got an older Boxer mix rescue dog who started developing large tumors exactly like a Border Collie I had- same vaccines, same vet. Like Ivermectin, there is another wormer that has gained notice called Fenbendazole (one brand name Panacur) as a potential treatment for cancer. I started her on a weekly regimen of the 3 dose worming schedule and all the walnut size tumors are gone and one grapefruit size tumor is only 1/3 of it's original size. I know it's anecdotal, but it repeats results others were reporting. Some research is showing that these wormers attack an identical mitochondrial substrate shared by parasites and cancer cells (research notes cancer is NOT a parasite) and causes mitochondrial cell death through a common metabolic pathway.
To say I don't trust most doctors and vets is an understatement.
The USDA is pushing for a preposterous and dangerous vaccine regimen in livestock now as well. Healthy animals do not need this crap. They want to put it in our food sources. Hmmmm, connecting the dots......
