Friend of the Wild

You are able to acquire an animal companion capable of being trained, which improves as long as you travel together.

Chose one beast of Challenge rate 1 or lower. The animal companion adds a number of extra hit die to its health equal to half your level and adds half your proficiency bonus to its attack rolls, armor class, saving throws and any dc's it might have. Theses numbers change as your level and proficiency bonus increase.