The study was a prospective, single-center, positive-controlled, unmasked clinical trial with dogs randomized in 3 treatment groups to receive PO ULDA or CL or both. Randomization was based on blocks of 3 using a table of random numbers. Block randomization was used with a 1 : 1 allocation ratio to maintain similar sample sizes in the 3 treatment groups.15 Allotment to the treatment groups was based on sequentially numbered cards to be seen at the time of case enrollment.