A Kansas couple who vowed decades ago to repay the University of Missouri’s veterinary school for kind treatment of their injured dog have made their largest gift yet to the institution.

Tom and Betty Scott, of Mission Hills, Kan., have donated $2 million to the university’s For All We Call Mizzou campaign as an unrestricted gift to the College of Veterinary Medicine on the Columbia campus, officials announced Monday.

The Scotts, both of whom attended the university in the 1950s, were newlyweds when they had their first contact with the veterinary school.

Their pet basset hound, Smiley, had suffered a broken vertebra. At the time, there was little the staff at the teaching hospital could do for a dog with a broken back