"Dog ingested my memory foam type ear plugs.?

It has been 24 hours since my Bichon Frise ate two of the purple "Flent" brand of ear plugs. They are like memory foam, when you squeeze them they are flat and then expand to fit your ear. He has had a bowel movement but no earplugs, but last night we was crying and his stomach was real hard. It lasted for about 10 minutes and stopped. He has not eaten this morning and no more pain has appeared. What should I do?