Wellness greetings to you
We human beings are not born with any fear inbuilt. we acquire them in one point of life. Now I would suggest you to rethink the moments where you initially had no fear towards the animals as you mentioned and there should be particular time frame in your life ,where with some triggered emotions you got this pattern of fear inside you build. If you are finding it difficult to do this kindly do take help from a professional.
Next Steps
For further guidance, do just reach me here.
https://prac.to/charanya-psychologist-dir