die Stute
mare
A fully grown female horse.
Auf der Weide grasten mehrere Stuten mit ihren Fohlen.
Several mares were grazing in the pasture with their foals.

mare
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mare
A fully grown female horse.
Auf der Weide grasten mehrere Stuten mit ihren Fohlen.
Several mares were grazing in the pasture with their foals.

'Stute' (mare) is the specific technical term for a female horse. The word is used when you want to emphasize the animal's sex, for example in breeding or veterinary medicine.
Der Tierarzt impfte alle Stuten auf dem Hof.
The veterinarian vaccinated all the mares on the farm.
The word 'Stute' (mare) is often used in the context of horse breeding. Common collocations are 'eine tragende Stute' (a pregnant mare) or 'eine Stute mit ihrem Fohlen' (a mare with her foal).
Die tragende Stute braucht besonderes Futter.
The pregnant mare needs special feed.
The word 'Stute' (mare) is often the base word in compounds that describe the horse's breed or function more precisely. Typical examples are 'Zuchtstute' (broodmare) or 'Rennstute' (race mare).
Diese Zuchtstute hat schon viele erfolgreiche Nachkommen.
This broodmare has already had many successful offspring.
horse
'das Pferd' and 'die Stute' both refer to the same animal category. 'Pferd' is the general name for the animal, whether it is male or female. 'Stute' is more specific and means only a fully grown female horse. Learners may confuse the words because a mare is, of course, also a horse. If gender does not matter, 'Pferd' is enough. If you want to emphasize that it is a fully grown female animal, 'Stute' fits.

Die Stute bleibt ruhig, während ihr Fohlen neben ihr läuft.
The mare stays calm while her foal walks beside her.
Omar sieht auf der Wiese ein braunes Pferd.
Omar sees a brown horse in the meadow.