As per your career goals, I would say go for PCB with Psycho. This will help you in two ways to pursue your future goal. Firstly, you can become a Veterinary Doctor. So if you do Animal Rescue then you will be a instrumental to support those animals and you can create a team more quickly and can work in first aid situations. Apart from this if you have a basic knowledge of Psychology then you can motivate and analyze people who does animal cruelty. This way you will be able to understand what wrong in them and you can start campaign based on those points. This will help you to build a good society as well as a animal affectionate society.

Now for PCB you have to study a bit of mathematics atleast for Physics and a bit for chemistry. But if you think above as a logical solution or a logical pathway towards your dream then I think you will be able to take some stress.

I hope this answer might help you. All the very best for your future endeavors!