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Very few carnivore's embryology is reported mainly restricted to old literature without new technique analyses. Also, their development focuses on pharyngeal arches and stem cell sources and the high capacity for differentiation from those cells to generate embryonic tissue. We aimed to use immunohistochemistry to prove the potentiality of these stem cell niches. The results were to highlight the timetable for the development of dogs and cats, the proper formation of pharyngeal arches and the description of these cells on first and second arches since 17–25 days of pregnancy. After that, the differentiation process is reduced.