The quote indicates a desire to break devoid of conventionality and embrace a more primal, instinctual lifestyle. Wild animals, unlike humans, do not have social standards, expectations, or limitations on their behavior. Rather, they act on impulses and instincts, responding to their environment and requires in the moment.
By desiring be "spontaneous like a wild animal," the speaker may be suggesting a desire to release themselves from the restraints of social norms and expectations. They may seek a more genuine or instinctive way of living that is unencumbered by the expectations of others.
The quote likewise highlights the speaker's desire for flexibility and a sense of lightheartedness. Wild animals are frequently associated with freedom, as they are not bound by human-made structures or constraints. For that reason, the speaker may want to live life with a sense of liberty, unencumbered by the weight of responsibilities, expectations, and societal norms.
In short, the quote suggests a yearning for a more natural, genuine, and spontaneous lifestyle, devoid of the conventions of society.
"Independence is all very well, but we animals never allow our friends to make fools of themselves beyond a certain limit; and that limit you've reached"
"Animals are reliable, many full of love, true in their affections, predictable in their actions, grateful and loyal. Difficult standards for people to live up to"