Fishy odor can also be caused due to vaginal infection in the case of a female dog. Their fishy smell and appearance can detect infected vagina and/or anal sacs in female dogs. Unless your veterinarian treats these infections with medication, they could develop into abscesses or ruptures, which can be pretty painful.
After ruling out anal gland disorders, if you see a light-colored discharge coming from your female dog, it could be a sign of vaginitis, bacterial, or yeast infections.
The female dog’s uterus can become infected, leading to the secretion of a white-yellowish substance from the vagina. Pyometra is the medical term for uterine infection, and this is a severe problem that demands quick action. Please take your dog to the vet promptly if you feel they have a Pyometra.
The primary cause of bad breath causing fishy breath is because they might have eaten stinky stuff like animal/insect droppings, fish food or treats, etc.
Strange odors originating from the mouth may be caused by renal or kidney disease, diabetes, or dental problems. Bad breath from periodontal diseases is due to the bacteria’s production of volatile sulfur compounds. Other origins of bad breath include results of bacterial metabolism from bacteria residing on the gums, top of the tongue, and plaque on the teeth.
Brushing your puppy’s teeth 2-3 times per week with toothpaste containing active enzymes will help reduce plaque buildup and bad smells. Using dental treats or ones that brush away dental plaque and tartar, such as bully sticks, will also naturally clean your dog’s teeth.
Urinary Tract Infection
Even if your dog eats a somewhat different diet than you, their pee should smell similar to yours. If you notice a strong stench that was not previously present, this is most likely an indication of a urinary tract infection, aka UTI. This is caused by bacteria in your dog’s urine that does not belong there, causing the urine to smell fishy.
Contact your vet to conduct a urinalysis to check for stones, RBCs, proteins, white blood cells, and any other signs of a urinary problem when you notice this bad smell. If an infection is found, your pup shall be given medications to cure the infection, which will subsequently eliminate the odor.