Causes of dogs getting fat:

1. If your dog is fed snacks frequently and the snacks are too high in calories, it will cause the dog to gain weight.
2. If the dog lacks exercise for a long time and the owner does not take the dog out for a walk, it will lead to fat accumulation.
3. When a dog has thyroid problems or tumors, it can also cause the dog to suddenly gain weight.
4. When a dog is neutered, it will also gain weight due to changes in body hormones.

5. Overfeeding dogs for a long time and overnutrition can also cause dogs to gain weight.