At @saillakeerie said they can be very fuzzy. Some state a minimum GPA but depending on the year and the quailty of the applicants they may not look at anything below some other number just to narrow down who they look at. Same with veterinary hours, etc. One year it could be one number and the next something totally different. Unless there is a direct statement saying you must have at least XX hours or at least XX GPA you have to do the best you can. When it is said explicitly then make sure you try to go over those numbers if possible.
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