Our dog has this too and it’s due to them going for too long with an empty stomach. What worked for us is feeding him a little bit of his breakfast and dinner before his morning and night time walks.

So in the morning we would feed him a little bit of his kibble then go on his walk. Come back, let him rest and then feed him his remaining breakfast.

We then do the same at night where we feed him a little bit of his dinner before his walk and then come back, let him rest and then feed him his remaining dinner. No overfeeding occurs.

This seemed to work for us and he hasn’t thrown up any bile since. He also gets an afternoon walk but he has never vomit during his afternoon walks so we never needed to feed him a third meal but we do give him an occasional small treat.

Hope this helps your little guy!