Introduction

Urinary tract infections (UTIs) are common in small animal practice. Escherichia coli are the most common bacteria isolated from UTIs in dogs. Previous studies have indicated that Staphylococcus spp. and/or other bacteria may lead to cause stone formation in dogs, especially struvite stones.

Objectives

The objectives of the present study were to study the most common bacteria isolated in dogs diagnosed with UTIs and those with UTIs associated with urolith formation in dogs.

Methods

The study conducted a retrospective study. All urine samples were collected by cystocentesis and later submitted to Veterinary Teaching Animal Hospital to identify bacterial infection.

Results

137 dogs diagnosed with bacterial UTIs, 74 females and 63 males, were enrolled in the present study. Proteus mirabilis and Staphylococcus spp. were the most common bacteria isolated from UTIs (55 samples [40.14%]). Meanwhile, in 82 dogs (59.8%) diagnosed with urolithiasis associated with UTIs, the most common bacteria isolated were Staphylococcus spp. (30.76%) and Escherichia coli spp. (19.23%), respectively.

Conclusions

Staphylococcus spp. and E. coli are the most common bacteria isolated from UTIs associated with urolithiasis. In contrast, several studies have indicated that the most common bacteria isolated from those with urolithiasis are Staphylococcus and Proteus. Moreover, the most common bacteria isolated from UTIs in our study were Proteus spp., while other studies have indicated E. coli. Further investigation on bacteria isolated from stone cultures could give more information on correlation between bacteria and urine stone formation