Thank you for sharing this and seeking answers and wisdom and knowledge.
Typically dreams are metaphoric, specifically functionally metaphoric, meaning that the function of what you dream about is a metaphor for your life or something in your life. Example, I was given a dream where I found my glasses and put them back on, this was a picture of me gaining my vision back, and that is what has happened and what I have experienced, shortly after that dream happened (other examples are money can represent something that is treasure or currency, a bad guy/wolf or something can represent an enemy, wall can symbolized a barrier, a knee or elbow can be flexibility, a foot can be your walk/movement in life, etc.). Or, sometimes they can be literal. Example I dreamed I moved my clothes from a basement into a room at the top of the stairs, and that's exactly what happened like a month later, I moved from my friends/mentors' basement to a room at the top of the stairs in the house.
Therefore, looking at your dream, having a baby polar bear as a pet, what is the function of a pet, and a baby/polar bear? A pet is something people have for enjoyment, companionship, entertainment, usefulness, and more. A polar bear is a large white bear found in cold climates (or the zoo : ), and a bear is large strong wild animal yet that can be tamed. A baby is small, young, immature version or state of something that it starts in before it grows into an adult/mature. So, I see from this, (without knowing exactly what happened to the bear, you, etc. in the dream) that your dream indicates that there's something in your life is a help, a companion, an enjoyment, etc. that is in an early stage in it's life, that is strong, powerful and wild yet tameable and amiable (desirable) and can be friendly. This could either mean that you will have something in your life in the future, have had something like this in the past, or do have it in the present and is showing you what it is is like, knowing only this much.
Hope this is understandable and helpful. And for more information there's a pdf on Mark Virler's website www.cwgministries.org under> free resources under > how to interpret your dreams, and Job 33 in the Bible/Word of God shows the purposes God gives us dreams for. Grace and peace.