Dog Development

From Embryology

Introduction

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.

Taxon

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

Development Overview

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).