I have a male chocolate lab now 5 months old. eats well, lots of energy, shiny coat,looks great. Throws up bile sometimes in the morning. We live by river and he likes to play by the river and of course wants to chew rocks and driftwood. We do watch closely and take these things away and attempt to teach him not to do that. Could this be the cause for the morning throwing up of bile. He is either in the house with us or closely supervised when outside but still manages to chew debree from the river.
Sometimes hyperactivity, diet or hunger will cause this. If it is daily, I recommend a visit to the vet for a further work-up. vetcare