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Background: Information is limited regarding the prevalence and importance of hepatic histologic abnormalities in dogs with gallbladder mucocele (GBM). Objectives: To (a) report prevalence of hepatic histologic abnormalities in dogs with GBM (b) evaluate for association between hepatic abnormalities and outcome in dogs with GBM (c) evaluate whether neutrophil‐to‐lymphocyte ratio (NLR) differs in dogs with GBM with and without specific hepatic lesions. Animals: Fifty‐two dogs with grossly and histologically confirmed GBM. Methods: Multicenter, retrospective study of dogs with GBM undergoing cholecystectomy with concurrent liver biopsy. Archived histological sections of gallbladder and liver evaluated by investigators blinded to data. Proportions of dogs with each histologic abnormality alive vs deceased at 1, 3, and 12 months post‐cholecystectomy compared. Mann‐Whitney U performed to determine if NLR differed in dogs with or without selected lesions. Results: 51/52 (98%, 95% CI [89%, 99%]) dogs with GBM had at least 1 hepatic histologic abnormality. Hepatic fibrosis (37/51; 73%, 95% CI [59%, 83%]), biliary hyperplasia (29/52; 56%, 95% CI [42%, 68%]), and portal inflammation (25/52; 48%, 95% CI [35%, 61%]) were most common. The proportion of dogs alive vs dead differed based on the fibrosis score at 1, 3, and 12 (P ≤.04) months post‐cholecystectomy. Dogs with hepatic necrosis (P =.006) and cholangitis/cholangiohepatitis (P =.02) had higher NLRs compared to dogs without these lesions. Conclusions and Clinical Importance: Histologic abnormalities of the liver are common in dogs with GBM. A higher portal fibrosis score might be associated with shortened long‐term survival after cholecystectomy for dogs with GBM. An increase in NLR might predict hepatic necrosis and cholangitis/cholangiohepatitis in dogs with GBM. [ABSTRACT FROM AUTHOR]