Gallbladder mucocele formation in dogs is characterized by an unrelenting accumulation of thick, immobile, and rubbery mucus within the gallbladder until the contents eventually obstruct bile flow or rupture into the abdomen. The syndrome was rarely reported1-2 prior to 15 years ago and has emerged as one of the most common, deadliest and poorly understood causes of gallbladder disease in the dog. Mucocele formation afflicts older dogs (mean, 9-10 years of age) and has a strong breed predisposition.It is particularly common in Shetland sheepdogs, Cocker Spaniels, Pomeranians, Miniature Schnauzers, and Chihuahuas as well as others.313 Gallbladder mucocele formation is uncommon in mixed breed dogs. There does not appear to be a sex-predilection; however, the impact of gonadectomy remains unclear.
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