Joe
Give your dog Trifexis!
Yes, it is expensive. Yes, it is chemical. Yes, it might harm your dog (is a very, very small percentage of the cases).
Or ... you can give your dog a few spoons of Guinness beer a month - it must be the one made is Ireland! Lol.
There are people who believe pumpkin seeds can cure cancer. And there are people who believe pray can save lives. This is called "mysticism". There is no proof of it, just faith.
I won't hold you right or wrong any way you choose to go. Just different.
A few decades ago, when dogs were not used for companion as they are today, they had a much better life. They would die more often, true. But they had more freedom as well.
One fact is immutable: your dog will eventually die. This is inevitable. And when he/she is gone, an empty hole will be formed in your heart. There is nothing to heal this.
Good luck in your endeavors!