The University of Guelph Graduate Studies page always contains the most up to date admissions details and requirements. 

General Entry requirements for OVC graduate programs

MSc: For entry to the MSc program, a BSc(Hons) or a DVM degree is required. 

PhD: Admission to the PhD program requires the completion of a MSc program by thesis although outstanding students may, subject to approval, transfer directly to the PhD program before completing their MSc degree. 

DVSc: A DVM (or equivalent) degree is required for entry into the DVSc program. 

Specific details about admission requirements can be found on the departmental websites.  Browse the Graduate Programs tabs to find the Degree and Department that you are interested in.