In addition, he advocated for various other causes, including anti-tobacco, anti-vaccination, anti-death penalty, anti-vivisection, Chartism, peace, women's suffrage, and hydrotherapy.

[1] Davie served as vice-president of the London Society for the Abolition of Compulsory Vaccination[3] and was a member of the Anti–Corn Law League.

[9] At the age of 46,[6]: 35  Davie became a vegetarian after reading Fruits and Farinacea and on the advice of a pro-vegetarian doctor that it would help his dyspepsia.

[10][11] Davie distributed vegetarian literature and arranged for the Society's brochures to be inserted into periodicals by booksellers.

[7]: 24 In 1874, Davie, W. Gibson Ward, Isaac Pitman, and Francis William Newman were described as "four leading vegetarians" in England.

[9] The Vegetarian Society presented an address to Davie in March 1890, to celebrate him reaching his 90th year.