FASLG and autoimmune thrombocytopenic purpura: Overall, here in our study we observed a high prevalence of aPL (adding up all aPL subtypes) in outpatient dogs with thrombocytopenia (98 %, Group I), immune thrombocytopenia with positive aPLT (100 %, Group IA), severe thrombocytopenia without aPLT (100 %, Group IB).