Oh, Michelle, I'm so sorry you lost your baby so suddenly.
This must be absolutely heart breaking for you and your daughter. You are wise to realize that Strauss is so happy and healthy now in Heaven, and you absolutely will one day be reunited. God bless you during this painful time of grief.
I am so sorry to hear about Strauss. I too lost a 9 year old to cardiomyopathy and his first symptom was lame back legs, loss of appetite and heavy breathing. They found a heart murmor near the end. It hits fast and can often take them before you can even diagnose the problem.
*hugs* to you and your family as you go thru these hard times.