Development of the cardiorespiratory system in dogs from days 16 to 46 of pregnancy - Martins - 2016 - Reproduction in Domestic Animals - Wiley Online Library
Puppy Development Stages with Growth Charts and Week by Week Guide
Puppy Development In Utero: A Week By Week Account - Faubert Miniature Schnauzers
Hudson & Lucy Puppies – Day 45 (pre-parturition) – The PUPPY CHRONICLES
Dog Pregnancy – Signs, Symptoms, and How Puppies Develop
Think your dog is pregnant? Here is how to find out!
Dog Pregnancy Symptoms and Concerns Around 45-50 Days | LoveToKnow
Your Dog's Pregnancy Week by Week - Baldivis Vet Hospital