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

That’s as tough a call to make as “the call” about his life. When I was in that spot with my last dog, it was during COVID so I was working from home and could be there for him. Thankfully, I got to go full time WFH after that, and I’m here for my senior dog currently as well (though she’s got several good years ahead of her, and the puppy she wanted 2 years ago keeps her plenty active lol).

My only hesitation about surrendering to animal rescue is that sometimes senior dogs are hard to re-home. Whoever adopts them has to expect medical bills for their care and have time to care for them. Or, worse, they end up in a “bad” home where the new owner doesn’t treat them as well or punishes them for things that have been fine all their life. Sadly, a lot of senior dogs can and do spend the rest of their days in a kennel at the rescue center which breaks my heart to think about (especially if they’re currently in a loving home).

I don’t know your situation well enough to give any advice (merely things to think about), but if at all possible, I’d say he’s better off in your care than going back through the rescue system. If for no other reason than the shock of re-homing and losing what he considers his best friend (you). Personally, I would only consider surrendering as a last resort if I’m completely unable to care for him financially or otherwise.