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To determine whether administration of dexamethasone altered serum trypsin-like immunore-activity (TLI) in healthy dogs.


12 healthy dogs.


Dexamethasone (0.25 mg/kg, PO, q 24 h) was administered for 7 days. Serum TLI, α-amylase and alanine aminotransferase (ALT) activities, and urea and creatinine concentrations were determined on days 0, 7, 14, and 21 of the study.


Serum TLI and ALT activities were significantly increased, and serum α-amylase activity was significantly decreased after administration of dexamethasone for 7 days. However, values obtained on days 14 and 21 were not significantly different from baseline values. Dexamethasone administration was not associated with any significant changes in serum creatinine or urea concentrations. Serum TLI and α-amylase activities were significantly correlated prior to dexamethasone administration. Dogs did not develop clinical signs of pancreatitis.

Conclusions and Clinical Relevance

Dexamethasone administration was associated with an increase in serum TLI. However, values returned to baseline 7 days after dexamethasone administration was discontinued. Serum TLI may be falsely high in dogs that have been treated with dexamethasone in the week preceding analysis. (Am J Vet Res 1999;60:1357–1359)

Free access
in American Journal of Veterinary Research


Immunoelectrophoresis and single radial immunodiffusion were used to identify and measure tear immunoglobulin concentrations in 50 healthy dogs. Immunoglobulin A and IgG were detected in all samples analyzed, whereas IgM was not detected in any sample. Mean IgA concentration was 25.28 ± 1.9 mg/dl, adult dogs (> 18 months) having significantly higher mean value. The IgA concentration related to age had significant (P < 0.006) positive correlation; mean IgG concentration was 23.10 ± 1.72 mg/dl. Linear correlation analysis revealed significant (P < 0.0007) correlation coefficient between tear total protein and IgA concentrations. The IgA and IgG concentrations also were significantly (P < 0.0001) correlated when expressed as milligrams per 100 mg of protein. Relation with sex was not established for either immunoglobulin.

Free access
in American Journal of Veterinary Research