Struggling to help my dog heal – any advice?

I never thought I’d be writing this, but I’m at a loss and really need advice. My dog, has always been the happiest part of my life. We’ve shared everything together, morning walks, lazy Sundays, even silly moments in the kitchen.

But lately, he hasn’t been himself. He doesn’t run to greet me anymore when I get home. He barely eats, spends most of the day lying in one spot, and sometimes whines softly at night.

The vet says it could be age-related, but seeing him like this is breaking my heart.

I’ve tried giving him his favorite treats, new toys, extra cuddles, nothing seems to spark his old joy. I can’t help but feel helpless, like I’m failing him.

For those of you who’ve gone through something similar, how did you help your dog when they started losing their spark? What made a difference for them?

Any tips, advice, or even encouragement would mean the world right now.