When a previously well-trained dog starts having accidents in the house all of a sudden, it may indicate an underlying issue that needs attention. Take note of any recent changes in their environment or routine that could possibly trigger this change in behavior. Stressors such as separation anxiety, new family members or pets, major changes in daily schedule, or unfamiliar surroundings might contribute to accidents indoors. It’s essential to rule out any potential medical concerns by consulting with a veterinarian before assuming it is solely behavioral. Addressing these sudden accidents may involve re-establishing consistent routines, reinforcing previous training methods through positive reinforcement, and potentially seeking professional help if needed.