Pus in the dog's urine may be due to urethritis

Bacterial infection of the urethral mucosa in dogs is called urinary tract infection, also known as urethritis. The main clinical symptoms are pain during urination in dogs, swelling and sensitivity of the urethra, and redness and swelling of the urethral orifice.
Difficulty urinating, painful urination, cloudy urine, and sometimes necrotic and detached urethral mucosa. The urine is streaky and the animal is distressed.

Treatment of urethritis:

Control infection, antibacterial and anti-inflammatory: ampicillin 10.0 mg, kilogram intramuscular injection, ceftriaxone 20.0 mg/kg intramuscular injection; roxithromycin 5 mg/kg oral .

Dogs have pus in their urine or have urinary tract infection

They show pain during urination, intermittent discharge of urine, and red and swollen urethral orifices. Male dogs may also experience swelling of the urethra, while female dogs may experience redness and swelling of the urethral orifice. If your dog's urinary tract infection is severe, you may see mucus or purulent urethral discharge.

Treatment of urinary tract infection:

It is recommended that the owner flush the dog’s penis with metronidazole every day and give anti-inflammatory drugs for treatment.

The dog has pus in the urine or is in heat for a long time and has not been neutered

Male cats or male dogs have narrow and elongated urethral openings, and semen may block the urethra. , leading to poor urination or even the inability to urinate. At this time, cats or dogs will often lick, because a large amount of bacteria will remain in the mouths of cats and dogs. In this way, the bacteria will enter the pet's urethral orifice, causing inflammation and infection of the urethral orifice, causing fungal or bacterial infection, which will Purulent fluid discharge occurs.

PS: A small amount of purulent liquid is normal. You should clean it in time. However, if there is a lot of purulent liquid and it turns yellow and smelly, It is recommended that you send your pet to a pet hospital for examination and treatment in time.