Between the male and female pointer as puppies, there is as little difference in mental activity as in physical; and even when adult, on the hunting ground, that great non-sexual field in which their highest mental and physical activities are displayed, there is little or nothing which distinguishes materially between the male and female; in method, manner, and quickness they are alike; in devotion to man, they are psychically identical.

(It is often said the female dog is more intelligent than the male; but I am almost inclined to doubt this, after long and close study of both forms.) It is at the moment when the reproductive element comes fully into play that similarity and identity cease.

In the intensity of initial sex instinct they are alike; the female will leap from windows, climb walls, and almost endanger her life to reach the male who waits for her, as readily as he will to gain her.

It is when the bitch lies with her six young drawing life from her breast, and gazing with wistful and anguished solicitude at every hand stretched out to touch them, a world of emotion concentrated on the sightless creatures, and a whole body of new mental aptitudes brought into play in caring for them, it is then that between her and the male who begot them, but cares nothing for them, there does rise a psychic difference that is real and wide.

Alike in the sports of puppydom and the non-sexual activities of adult age; alike in the possession of the initial sexual instinct which draws the sex to the sex, the moment active sexual reproduction is concerned, there is opened to the female a certain world of sensations and experiences, from which her male companion is for ever excluded.
So also is our human world: alike in the sports, and joys, and sorrows of infancy; alike in the non-sexual labours of life; alike even in the possession of that initial instinct which draws sex to sex, and which, differing slightly in its forms of manifestation is of corresponding intensity in both; the moment actual reproduction begins to take place, the man and the woman enter spheres of sensation, perception, emotion, desire, and knowledge which are not, and cannot be, absolutely identical.