Well, I am trying to help, but am afraid I am just creating more of a muddle. His tombstone means he was in the Spanish American War... but as you can see from what I am posting below, some other sources say WWI and give a different father's name than his obituary.
Since the Spanish American War was first, I imagine most of his service was actually in it and perhaps his father's name was John Samuel, hope these help.
DOSS, WWI Vet, Dies, Funeral Riles Incomplete
Nick J. Doss, 78 of White Oak, died at 6 p.m. Thursday in the Beckley Veteran's hospital where he was admitted Monday.
A resident of Raleigh county for over 60 years, he was born in Ronaoke Va., August 9, 1874, the son of Mr. and Mrs. John Doss.
Survivors include his wife, Mrs. Ethel Doss, three daughters, Mrs. W A Stump of Helen, Mrs. Virgie Jackson of Beckley, and Mrs. George Oliver of Ronoake, three sons, George of MacArthur, Roy of Beckley,
and Joseph of Detroit, Mich., a sister, Mrs. Ida Doss of Ronoake,
two brothers, Thomas of Ronoake, and Lewis of Danville, Va.,
17 grandchildren and six great-grandchildren. Funeral arrangements are incomplete.
page 12—Raleigh Register, Beckley. W. Va.,
Friday Afternoon. November 21, 1952
There is a draft registration card for him that is for WWI----World War I Draft Registration Cards, 1917-1918
Name: Nick Joe Doss
City: Not Stated
State: West Virginia
Birth Date: 9 Aug 1875
occupation: coal miner
employer: McAlpin Coal Co.
nearest relative: Mrs. Martha Doss, wife
yet---his death certificate says his father's name is Sam and that he was in the Spanish American War.
here is the link: