The domestic dog (Canis lupus familiaris) has been derived from an ancestoral wolf and now consists of a breed family of more than 300 worldwide, with extensive variations in morphology (size, shape and weight).
There have been identified about 400 congenital disorders relating to dog development.
NCBI Taxonomy Browser Canis lupus familiaris (Genbank common name: dog)
Synonyms: Canis familiaris, Canis domesticus, Canis canis
Chromosomes: 40 (38, X, Y)
Genetic code: Translation table 1 (Standard)
Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)
Lineage( full ):cellular organisms; Eukaryota; Fungi/Metazoa group; Metazoa; Eumetazoa; Bilateria; Coelomata; Deuterostomia; Chordata; Craniata; Vertebrata; Gnathostomata; Teleostomi; Euteleostomi; Sarcopterygii; Tetrapoda; Amniota; Mammalia; Theria; Eutheria; Laurasiatheria; Carnivora; Caniformia; Canidae; Canis; Canis lupus
--Mark Hill 08:28, 21 April 2010 (EST) Content under development (notice removed when complete)
Days shown below relate to days after ovulation (day 0).
2 to 5 days - fertilization
14 to 16 days - embryo attaches to uterus
22 to 23 days - heartbeat visible
62 to 64 days - parturition (birth or whelping)
Sexual differentiation begins early in the embryonic period prenatally and continues into early postnatal life.
Caudal vena cava development- five theories to origin (right-sided supracardinal, caudal cardinal, sacrocardinal, lateral sympathetic or subcardinal veins).