I have a noce whitethorn hedge. It takes about 5 years go get to 6 feet. YOu buy the small plants, known as 'quicks' at 2 to 3 feet. They are easy to set and you should nip the tips of every on at about 18 inches to encourage thicker growth. No gurrier will every get through it.
If you want something quicker, you could get griselinia or escalonia. Both grow quickly, but there is little security.
Another sugegstion would be rose. There is a rose, rosa rogosa that gives a thorny hedge and is quite thick.