The snow elves have always been living with a deep spiritual bond to nature, wheter it be plants or animals (similarly to other elven people).
Starting at a very young age they are constantly roaming the frozen steppes,forests and icy peaks of Fáwëndor.
It's very common for young elves to form a magical bond (gwedh) with a creature that lives in the wild.
They never try to domesticate it and just use their magic to communicate with it and roam free in their habitat.
One of the most seeked companions is the deer, which is a sacred animals in the elves' religion.