I have used the product I mentioned for a very long time and my cats have been fine. However, I do understand why you would be cautious about using it after your older dog was diagnosed w/cancer.
I would definitely try something else on him. He's young to be acting like he's got dementia.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
