My dog is 1.5 years old, and so far his potty training has been complete for the past year. Suddenly for one day, he pooped 5 times inside the house. I doubt this is because of stress because he seems happy and playful, and he is used to being left alone for an hour a day. I also don't think it is because of his diet, because he has had the same food for 6 months without any problems. It would be great if you could think of anything wrong with my dog, and if you recommend going to the vet.
Thank you in advance