Animals operate from a collective consciousness, ie; Flock consciousness, herd consciousness, pack consciousness. When they are together outside of human influence, they influence each other in more of a primal instinctual way, and they react to their environment accordingly. You might notice a herd of horses or a flock of geese all behaving in very similar ways to each other, all in tune to the slightest vibrational shift as a whole.
This is the reason we can breed for certain characteristics. The consciousness around a particular breed has become so strong and gained so much energetic momentum as a whole, that when the soul meets the body they adapt to the traits of that collective within their species.
But there are outliers, and they are this way due to their coexistence with humans.
Humans take individual animals out of their herds, packs, flocks... out of their collective consciousness and ask for individualized personalities through our environment and what we are sending out vibrationally.
Think of a choir. Each person unique in who they are, but for the moment they are singing a song together, they are a collective working in unison. Each bringing their own voice to the song, but speaking the same words and very similar vibrational energy.
Then the director might single one individual out and have them sing a solo - this is what we do when we turn our attention toward our animals. We say: "I want you to come over here and live with me and sing this part." So they start to learn their solo, in the way you want to hear it from your perspective, as they also adapt to the environment you've offered them.
You can understand now why your animal behaves differently towards different people, or why the animal you bought turned out to be wildly different from your expectations.
Each of us are playing a different part in the same song.
Different frequencies, different instruments, same song.
PS: Animals tell me that when they dream they are returning to their collective