Infections, tumors, spinal cord injuries, kidney disease and problems with the bladder can cause incontinence in dogs of any age and can lead to house-training accidents. Diseases that cause increased drinking, such as diabetes, may result in increased urination and accidents.Click to see full answer. Accordingly, why does my dog have accidents at night?Other times, your dog could be marking his territory in a spot that he previously peed on and can still smell. Another reason that younger pups have night time accidents has to do with when they eat and drink. Their bladders are small, and empty faster than older pooches.Also Know, why has my dog started peeing in the house at night? Urinary Tract Issues If your dog suddenly starts peeing in the house (or other unacceptable places), it could be caused by a urinary tract infection. If your vet diagnoses a urinary tract infection, the next step is a course of antibiotics. One may also ask, why is my dog suddenly having accidents in the house? This is because there are a number of common illnesses and medical problems that often cause dogs to have accidents in the house – some possibilities would include a urinary tract infection, bladder stones, chronic kidney disease, diabetes, Cushing’s disease, and prostate or bladder tumors.What to do when your dog keeps having accidents? Here’s what to do when that happens: Interrupt your puppy when you catch them in the act. Make a startling noise (be careful not to scare them) or say “OUTSIDE!” and immediately take them to their bathroom spot. Don’t punish your puppy for eliminating in the house. Clean the soiled area thoroughly.