How are people dealing with senior pets when they live alone?

I have a wonderful senior dog and he’s my best friend. And I’m so scared of his aging. As he’s slowing down and I keep an eye out for medical issues I just can’t imagine how and when to make a call about his life.

I work all day away from home and live by myself, which was not the situation when I’d adopted him initially. I don’t have a community or friends or family around to help during the day if and when it comes to that. I can’t afford dog sitters especially not ones with training.

What if he could be fine with more support and money, should I give him back to animal rescue?