I was in the same boat Southerngirl.

I started out Pre-Vet and then decided I wasn't really sure if that's the route I wanted to go. So, I did a little research with my advisor and found that I could switch to Animal Science very easily--the courses are very similar depending on which Animal Science option you take. So my thinking was I could still have a degree that would cover 99% of the careers I'd be interested in, and still be able to easily switch back to Pre-Vet if I should want to. As an Animal Science major you can still work in the veterinary field as an assistant or technician, I believe. The best thing you can do to help you decide and to help you get into vet school if you decide to is to work for a vet. Experience working alongside a vet is a big plus. You will need letters of recommendation from vets too, so working for one gives you at least one who should write you a good letter of recommendation. I talked to my vet about my interest in vet school and he had a TON of good advice for me, and even let me watch a few surgeries to give me an idea of everyday work for him. He's been awesome. According to several vets I have spoken to and many professors, most of the vet schools in the country are looking for a MINIMUM of 4.0 GPAs right now. Excellent grades are a must to get in.
The tough part about being a dog trainer for a living is that, at least until you get some name recognition, your income will fluctuate greatly due to demand. You will have the best opportunities in or near big cities, but still getting started is the tough part. It is definitely good to have a degree behind you in case the training thing doesn't work out though. That's pretty much what I
think I am doing right now, lol.
Aaaaand I just realized Southergirl's post was not the original post, and was not necessarily asking for any advice.

Haha. Ah well, I'll just leave this in case anyone did have questions pertaining to either one. LOL!