The dog, as well as all animals which produce more than one or two at a time, is not perfectly formed at the time of its birth. Dogs are commonly whelped with their eyes shut; the two eyelids are not only closed together, but adhere by a membrane which breaks away as soon as the muscles of the upper eye-lid acquire sufficient strength to raise it and overcome this obstacle, which commonly happens about the tenth or twelfth day. At this time the bones of the skull are not finished, the body and snout swelled, and the whole form incomplete; but in less than two months they learn to make use of all their senses, begin to have strength, and their growth is very rapid. In the fourth month they lose some of their teeth, which, as in other animals, are soon replaced by others that do not fall out. They have in all 42 teeth, namely six incisive, and two canine at top and at bottom, fourteen grinders in the upper, and twelve in the under-jaw; but these latter are not always the same, as some dogs have more grinders than others. When very young, males and females bend down to void their water; about the ninth or tenth month, the males and some females begin to lift up their legs for that purpose, and at which time they begin to be capable of engendering. The male can couple at all times, but the females only at stated seasons, which are usually twice a year, and more frequently in winter than in summer; this inclination lasts ten, twelve, and sometimes fifteen days and shews itself by exterior signs; the male is apprized of her situation by his smell, although she seldom consents to his approaching her for the first six or seven days. Once coupling is sometimes sufficient for her to produce a great number of young, but if left at liberty she will admit many times a day almost every dog that presents himself. It has been observed that when allowed to choose for herself, she generally prefers the largest, without attending either to his form or beauty; and it frequently happens that small bitches who have received large mastiffs die in bringing forth their young. It is well known that these animals, from a singular conformation, cannot separate after consummation, but are obliged to remain united as long as the swelling subsists. The dog, like several other animals, has not only a bone in its member, but also a hollow ring, which is very apparent, and swells considerably during the time of copulation. The females have perhaps the largest clitoris of any animal, and while compressed, a swelling arises which probably lasts longer than that of the male, and forces him to remain; for when the act is finished he changes his position, to rest on his four legs; he has also a melancholy air, and the efforts for separation are never made on the female side. Bitches go nine weeks with young, that is 63 days, but never less than 60. Those of the largest and strongest make are the most prolific, and those will sometimes produce ten or twelve puppies