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Bacterial Infections in Dogs and Cats: Symptoms and Medications
Bacterial infections in dogs and cats range from leptospirosis and Lyme disease to E. coli, brucellosis, pasteurellosis, staph, and salmonella. This guide summarizes each disease's signs and the drugs and prevention that matter most.
Suspected ringworm, or fungal and bacterial infection.
From the photo the local hair loss suggests a fungal infection. Shave and apply an antifungal spray; use a whole-body antifungal shampoo if it licks elsewhere, and keep a collar on through the long treatment course.
Holes Appeared on My Cat’s Abdomen; the Vet Said It’s a Bacterial Infection
Cat skin ulceration and redness have many causes: (1) an existing wound licked repeatedly, then infected, causing redness and ulcer; (2) parasite or fungal infection left untreated, then mixed bacterial infection. Per the photo, dense holes and bruising suggest progressing to cellulitis; take the cat for cytology and debridement, use antibacterials, and keep the e-collar on strictly.
My Roborovski hamster is 1 year 8 months old; its ear canal bacterial infection has been treated with doxycycline for 15 days and improved, but the outer ear will not heal. It recently lost tens of grams. What else can I use?
Ear canal bacterial infection in hamsters needs cleaning and topical medication, plus regular cage disinfection. Clean with a fine swab and ear solution, then apply neomycin ear oil 2-3 times daily.
My dog has a cough, was diagnosed with bacterial upper respiratory infection, and is now coughing worse — what should I do?
Upper respiratory infection is caused by bacterial or viral invasion of the airways and is risky for weak, low-immunity dogs. If injections and oral medicine are not working, ask the vet about nebulized antibiotics or IV anti-inflammatories. Keep the dog warm at night, and for unvaccinated puppies recheck for kennel cough, distemper, and parainfluenza as cough worsens.
How to Treat Fungal or Bacterial Skin Infection in Dogs
Fungal dog ringworm is treatable, fast if caught early and slower (4–6 weeks) if widespread. Clip the fur, apply antifungal spray and ointment, add vitamin B, and keep the environment clean to stop reinfection.
What to Do When Your Dog Has a Urinary Tract Infection
Urinary tract infections (UTIs) are common in dogs and cause painful or frequent urination, blood in the urine, and general discomfort. Mild cases respond well to antibiotics, but bladder or kidney stones can mimic the same signs and may need imaging or surgery. Good hygiene and diet adjustments are key to preventing recurrence.
Common Causes of Urinary Tract Infections in Dogs
Around 14% of dogs get a urinary tract infection — usually bacterial (E. coli and others), sometimes fungal, and often tied to bladder stones, kidney disease, or incontinence. Everyday drivers include holding urine over 12 hours, a constantly damp environment, and salty or spicy food. Watch for blood in the urine, genital licking, yellow discharge, and painful, incomplete dribbling on walks.
Pet Skin Diseases (Part 1): Parasitic and Fungal Infections
Skin disease is common in dogs and cats and tends to flare up and recur, usually because their skin defenses are weak and their surroundings are full of triggers. The two hardest types to clear are external-parasite infestations (fleas, lice, mites, ticks) and fungal infections (ringworm); both cause intense itching, hair loss, and skin damage and need treatment of both pet and environment. Since they are contagious and slow to resolve, early veterinary care and consistent parasite control are the keys to recovery.
Treating E. coli Infection in Dogs and Cats
Colibacillosis is an acute intestinal infection of young dogs and cats caused by pathogenic E. coli, marked by fever, vomiting, and foul-smelling diarrhea that can turn fatal. It mimics many other diseases (distemper, parvovirus, salmonellosis), so a lab test is needed for diagnosis; treatment is antibiotics chosen by sensitivity testing plus strict hygiene and early colostrum.