What Does It Mean When Your Pet Has a Taurus Sun on March 21? The Sun sign represents the core of personality, the essence of who your pet is. Taurus, an earth sign ruled by Venus, is known for being steady, patient, and affectionate. Pets born on March 21 fall right at the cusp between Pisces and Aries, but with the Sun in Taurus, they tend to embody the grounded and reliable nature of this sign.