Just to be devils advocate, I would not discourage you away from a 4 year degree at this point, especially if you think you may want to do something else in your life in the future. Some vet tech programs award you an associates degrees and most don't. Would you be happy in the work force for your career as a "high school graduate" rather than a "college graduate"? Have you looked through any career/job websites? Almost every entry level job requires 4 year degree. If vet tech becomes not everything you think it will be in 10 years and you have a family with 2 kids, will you be able to go back to school? Will you be happy being "stuck" in your career or working at fastfood, walmart, janitorial, warehouse and other entry level "high school graduate" jobs?
Being one of the "older" people on this board, I've seen people when they burn out of their job and when they don't have the previous education to give them good option in the current job market where a BS is the new high school diploma. On top of that, I hear time and time again, that "I can't go back to school now", because of family, mortgages, car payments, spouses, ect. People do it, yes, but they are the exception not the rule.
Lowest debt is often the best answer, but don't not go to school to keep debt down. Rather, keep debt down while going to school. The stats are all over the internet that the people with a college degree have greater earning potential. I remember hearing something like, $1.5 million greater earning in an average person's career (including lost time/money during college).
There are many lifetime vet techs out there, but for each one of those 30 year vet techs, there were probably 20 they worked with that changed careers.The diversity in a vet tech career is fairly slim and advancement is almost nill. Those are considerations to keep in mind.
Also consider that in general your "time cost" is much lower after you graduate from high school than later in life. Therefore, this is the cheapest, most economic time to get a 4 year degree. I've known people that have stayed at home or in a pretty cheap, multiple roommate home, drive a car their parent bought for them, gone to their instate for 3-6K per year and been able to pay off tuition and daily expenses through part time work and summer work. Compared to taking out loans in 10 years to cover house payment, car payment, insurance cost, your expensive baby, and working parttime to cover tuition and your personal daily expenses. That will leave you with much more debt!