On average, dogs need to go outside at least 3 to 5 times per day to have the opportunity to relieve themselves. Veterinarians recommend that adult dogs go no more than 6-8 hours between trips outdoors.
So,it becomes abnormal for a dog to pee at that sequence and that definitely poses something's wrong.
Urinary tract infections, cystitis (bladder inflammation), bladder stones, kidney disease, or arthritis or age-related incontinence could all be causes of too much urination in dogs. In addition, pets with diarrhea or other intestinal illnesses may not be able to hold urine for long.
However, this means you have to visit your vet as quick as possible.
Best regards.