TL;DR: Fever, back pain, and frequent urination in dogs often indicate a serious infection like pyelonephritis or prostatitis, requiring veterinary care within 12 to 24 hours to prevent sepsis or kidney damage.
What causes fever, back pain, and frequent urination in my dog?
A combination of fever, lower back pain, and increased urinary frequency often indicates an inflammatory or infectious process. Common culprits include a Urinary Tract Infection (UTI) that may have ascended to the kidneys (pyelonephritis), or in male dogs, an infection of the prostate gland. Sometimes, spinal issues like Intervertebral Disc Disease (IVDD) can cause referred pain and changes in bladder control, though a fever more strongly points toward an infection.
Is it an emergency if my dog has a fever, back pain, and urinary changes?
- This situation is classified as Medium Urgency, requiring veterinary care within 12 to 24 hours.
- Seek immediate emergency care if your dog is unable to produce any urine or is persistently vomiting.
- Prompt treatment with antibiotics or anti-inflammatories is necessary to prevent life-threatening sepsis or permanent kidney damage.
How can a photo or video help my veterinarian triage my dog?
- Provide a video of your dog moving or attempting to urinate to help the vet determine if the "back pain" is actually a hunched posture from abdominal distress.
- Take a clear photo of your dog’s urine, especially if it appears discolored, cloudy, or contains blood.
- Share these visual aids with your remote triage nurse or attending veterinarian to provide immediate evidence of the severity of the urinary tract involvement.
Clinical Context (Merck Veterinary Manual)
In dogs presenting with fever, back pain, and frequent urination, careful questioning of the owner regarding specific clinical signs is crucial to help localize the source of the fever. The physical examination should be detailed, including neurologic and rectal examinations, and repeated frequently. A minimum database should include a complete blood count (CBC), serum chemistry profile, and urinalysis with urine culture, regardless of urine sediment appearance. Thoracic and abdominal radiographs are useful screening tools for fever localization, and skeletal radiographs may be warranted. Acute abdominal pain requires localization of the pain and auscultation of the abdomen for bowel sounds to localize the problem to the reticuloendothelial reproductive, urinary, or GI systems.
Chapter: Diagnosis
Source: The Merck Veterinary Manual, 11th Edition (Page 1016)