Here's the info from the website.
"When decisions are released, if you receive an OFFER to the D.V.M./M.P.H. program, you will not be further considered in the regular DVM admissions pool, regardless of whether or not you accept or decline the D.V.M./M.P.H. offer. If you are denied or designated as an alternate for the D.V.M./M.P.H. program, your application will be considered in the regular D.V.M. admissions pool."
D.V.M. and M.P.H. Combined Degree Program - College of Veterinary Medicine & Biomedical Sciences
So if you get into the DVM/MPH program you are expected to accept the spot. If you don't get into the DVM/MPH program, you will be considered for the standard DVM program.
Because the dual programs are often on their own timelines, you may not get an admission's decision at the same time as the traditional applicants.