INS and Hypoglycemia: Reasons for exclusion of 181 of 185 (97%) diabetic dogs examined during the study period included concurrent illness documented in 166 of 181 dogs (92%), administration of medication that warranted exclusion in 106 of 181 dogs (59%), use of an insulin other than NPH in 55 of 181 dogs (30%), owners who did not reply to attempted contact by the research team or declined to participate in the study in 23 of 181 dogs (13%), death or euthanasia by the time the owners were contacted by the research team in 5 of 181 (3%) dogs, and a recent hospitalization for hypoglycemia in 1 dog (0.5%).