Truman's surgery - God's plan

How do I explain to a golden retriever that all the pain he is feeling is for his own good? Truman had four tumors taken off yesterday. My blissfully happy dog is now exhausted and uncomfortable. The pain meds zonk his energy and even going outside to relieve himself is hard. Big swaths of his gorgeous fur are gone.

It reminds me of how I rail against God when I go through tough times. Instead of saying, "You know the plan and I trust you," I cry and scream, "Why did you let this happen to me?" Like Truman, I don't see the end game. I don't see the why. Like Truman's surgeries, all my losses, times of grief, and great disappointments, have made me who I am today. Without these trials I would be a less compassionate human being who is