He exhibited at the Royal Academy several times, beginning in 1866. His paintings are signed “Jno Emms”. The couple lived in London for a time but returned to Lyndhurst in 1881 and built a large house and studio named The Firs, where Emms lived for the rest of his life.
He died in Lyndhurst.
His painting of "Callum" a Dandie Dinmont Terrier hangs in the National Gallery of Scotland. Emms is considered a painter of great ability.
According to the American Kennel Club, his painting The New Forest Foxhounds is valued at an estimated $800,000-$1.2 million.