My dog has been undergoing sudden and rapid weight loss and I can't tell why! Not much has changed in his diet but he definitely looks skinnier and I'm really worried.
Take your dog to the vet.
Sudden, unexplained weight loss can be a sign of serious illness. A visit to a vet is highly recommended.
Sudden and rapid weight loss is a sign that your dog could be in medical distress. They should be taken to their regular veterinarian for evaluation.
First and foremost, a visit to the Vet is mandatory to make sure there are no underlying issues regarding thyroid, kidneys, etc. They will check by not only performing a physical exam, but by performing blood chemistries and a CBC to make sure there are no underlying conditions. Besides a vet visit, a change is food may be necessary also. A food that is higher quality and higher in protein and fiber can help your pet not only feel full, but also help maintain a lean body weight. If the food is made with prebiotics, that helps encourage more positive bacteria in the intestines so that your pet will actually absorb the vitamins and nutrients they are eating, and produce smaller, more formed stools. Whereas, if your pet was consuming a lower grade food, they would eat all day, but they would also defecate frequently too.