Sorry - there is no way this is physically possible or academically possible.
1. It's unlikely that the university would approve an
Animal Science/Computer Animation dual major; they probably don't offer a "minor" in Computer Animation (at least not to someone majoring in a totally unrelated field). The Animal Science department may not even allow minors or dual majors.
2. Even if you could finesse #1, you would undoubtedly run into multiple schedule conflicts each semester trying to stay on track with required courses in the two subjects. (Remember that college is not cable television or TiVo - you have to take the classes when they're offered and there are generally only 1-3 sections of the upper-level courses offered each semester, even at the largest universities.)
3. You would also not even be able to schedule enough classes to consume 8 hours a day of classroom time. Colleges set limits on how many credit hours you can enroll in in any given semester; 8 hours of "clock time" a day would equate to well over 30 credit hours per semester.
4. Unless you take some of the "night school" classes while you also are physically in the day classes, there won't be 8 hours of classroom time scheduled at night. Think about it - if the night school classes started at, say, 6:00 p.m., they would have to run until 2:00 a.m. to consume 8 hours. You will also find that there is a much more limited choice of classes and majors available in colleges' evening programs.
5. Do you really think you'd be able to finish all of the reading, writing, studying, projects, meetings, etc. that would go with a totally maxed-out academic schedule like this in only the part of the "other" 8 hours you wouldn't be asleep, taking a shower, eating or collapsing on the steps of the campus health center?
6. $800 a month will barely pay for an A&M dorm. The typical room-and-board charge for freshman THIS FALL is $8,039 for the academic year. As a freshman, you would likely not be able to decline (and maybe not even minimize) the board contract; that option is usually only available to freshmen who are commuting from home. Living off-campus introduces the problems of finding someone to split costs with, paying for/finding transportation to and from campus, and scheduling in more time in each day for "commuting", grocery shopping and cooking.
Slow down, talk to some kids you know from your HS who have started college (especially those already at A&M), and revisit your plans in about six months.
P.S. Contrary to the one previous answer, you will NOT have 8 hours of homework every night in college. If that was true, there would be about 150 people in college across the country right now. You will have regular homework in some classes; you will have reading homework prior to each class meeting in most classes; and you will have projects, papers, etc. due periodically. Your actual workload will vary greatly with your course of study and the particular classes you're taking in a given semester.