Is it possible to get a bachelors in science and use it for a RN degree

Yes it is possible to get a bachelors degree in science. Which area of science would you like to get your bachelors degree in? Students who want to become a veterinarian typically study animal physiology and anatomy, biology, zoology, animal science, chemistry and microbiology. Ultimately it depends on which college or university you will be attending. That will require different things prior to getting your degree.

You will also want to volunteer or intern at animal shelters and animal clinics. This can also be done at local aquariums, farms, or ranches. Work hard the whole time and you might be able to get a letter of recommendation from them. So long as you keep you keep you GPA up, the experience and recommendations will only help you get into the school you want. If your GPA drops, this doesn't mean the end of your career, just prepare for the need to get more experience and recommendations.

Here is a short article you may want to read that gives you the basics of what you have to achieve, post undergrad, to become a veterinarian.
http://work.chron.com/education-training-need-become-veterinarian-6828.html

I am currently taking pre-requisites to apply to dental school. Nursing isn't a job like working at Starbucks or getting a job for the summer where you get trained for a couple weeks and go right into working with the intent of holding the job temporarily. Nursing school is extremely difficult and time consuming. Nursing school is four years of college with two years of prerequisite courses (that will help you to some extent with fulfilling your obligations for vet school - i.e. biology, anatomy, chemistry, etc.) then it is two years of nursing school. It varies slightly with which nursing school you go to but many nursing schools have the scheduling of being in class from 8am-4pm with one hour break for lunch with a few 5 minute breaks here and there 4 days a week along with many hours of clinical time, tons of homework/papers, worrying about not getting a B- or better otherwise you fail the class, paying $300 to take the licencing exam, practicing for the exam, paying for your licence, getting a job at a hospital and working 12 hour shifts, then trying to go back to more school to fulfill more prerequisites. When you are in vet school you don't have time to work a healthcare oriented job, school is your job. I would highly recommend against it if you have the intent of having another career before going to nursing school. I would do everything you can to advance yourself toward graduating from Vet school as Vet schools are as difficult to get into as medical schools are and are 4 years of undergraduate work along with 4 years of Vet school. Good luck with everything

Becoming a nurse with the education of BSN - bachelor's of Science in Nursing- is required and then to work as a nurse, you must also pass a test called the NCLEX to become an RN. It is a difficult test and not one that you could pass (or that they would allow you to take) if you got a general bachelors of science. So- I think if you want to become a veternarian, you really should pursue the track that would help you most. I don't believe a nursing focus on human anatomy and physiology would help you in this direction. But I certainly understand your concern about the money! Nurses make a good salary- but it's a big investment to then switch to another field later. Best of luck to you!!
Teresa