https://www.youtube.com/watch?v=XS9fiDn4Qo8&ab_channel=TEDxTalks

Interesting, these old rottweilers:

1. Had more than one cancer but they turned them into non-lethal annoyances, a neat trick for us to learn!

2. Cortisol levels and stress—cortisol (the stress hormone) levels were not elevated in these very old (equivalent to 100 years in humans) dogs and injecting the hormone did not have any effect.