Devotion: What is it? Does it exist today?

I noticed Charlie paying complete attention to his master who happens to be eating.
His hope is something will drop rewarding him for his attention.
He may not get a treat now but just being at the feet of his master is enough to fill Charlie with contentment.
The dictionary suggests devotion is an act of worship and prayer or an act of dedication to a cause.
When I saw Charlie so attentive today I thought of God The Father who gave His Only Son to clear the way for us to be in relationship with Him.