> We haven't seen an increase in cancers in dogs in recent years like we have with people.

Some folks say we have, that it's still similar to the cancer rate in humans and higher than the cancer rate seen in animals that aren't pets. https://www.cnn.com/2017/02/03/health/dogs-cancer-partner

although it also seems like it's not something that's been being tracked very well https://www.veterinarypracticenews.com/evidence-based-medici...