ABSTRACT. Clinicopathological features of mammary gland tumors (MGTs) in 101 dogs were evaluated retrospectively. The incidence of histological malignancy in 60 small-and 41 other-breed dogs were 25% and 58.5%, respectively. In 82 epithelial MGTs, small-sized tumors (< 3 cm) or non-invasive tumors were predominant in small breeds. In multivariate survival analysis, small breed (p=0.048) and lower stage of tumor cell invasion (p=0.006) were significantly associated with longer survival time. These results suggest that the incidence of histological or biological malignancy in MGTs is lower in small-breed dogs than in others. KEY WORDS: canine, clinicopathological survey, mammary gland tumor.

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Several factors are suggested to be involved in the development of nontraumatic inguinal hernias (NTIHs) in dogs, but case series studies focusing on the etiology and treatment outcomes are limited. The aim of this study was to retrospectively evaluate the clinical characteristics and treatment outcomes of NTIHs in dogs. Medical records of 42 dogs with surgically treated NTIHs were reviewed. Forty-one dogs were included in the study, all dogs were small breeds weighing <10 kg, and middle to older age (>5 yr old; 33 cases), female sex (34 cases), and miniature dachshunds (26 cases) predominated. Left-sided occurrence was common (30 left, 9 right, 2 bilateral), and organ protrusion was seen in 22 cases (15 uteri, 9 small intestines, 1 colon). Fourteen of 15 uterine herniations (93%) were located left side. Ovariohysterectomy was performed with herniorrhaphy in 27/30 intact bitches, two of whom also underwent resection and anastomosis of a devitalized portion of the small intestine. Recurrence was seen in only one male dog. These results suggest that NTIHs are more likely to occur in small-breed female dogs, and that age may increase the risk of left-sided uterine protrusion; however, the long-term results after herniorrhaphy with ovariohysterectomy are excellent.

A 4-year-old female French bulldog presented with a 6-month history of right-sided head tilt and acute onset ataxia. Magnetic resonance imaging (MRI) showed a large mass lesion at the cerebellomedullary pontine angle. The dog was able to stand and walk after beginning symptomatic therapy with prednisolone, acetazolamide and glycerin. Magnetic resonance imaging 10 months after the first examination indicated slight expansion of the tumor. The dog was able to walk with continuous symptomatic therapy for 15 months until death, although the head tilt persisted. On postmortem examination, the gross tumor was slightly larger than when seen on the second MRI scan and was histopathologically diagnosed as a choroid plexus papilloma.