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Firstly, evaluate the environment and routine. Any changes in the household or daily schedule can cause stress or anxiety in dogs, leading to a temporary loss of appetite. If this is the case, try to re-establish normalcy and provide a calm environment.
Next, consider the quality and freshness of the food. Sometimes dogs will refuse to eat if the food is spoiled or if they are bored with the same type of food. Offering a different flavor or a fresh batch might entice your dog to eat.
Dental issues are also a common cause of appetite loss in dogs. Check your dog's mouth for any signs of dental disease, such as bad breath, swollen gums, or loose teeth. These can cause pain and make eating uncomfortable.
If your dog is up to date with heartworm vaccination but not on flea and tick prevention, consider the possibility of parasites. Although less likely with regular heartworm prevention, parasites can still affect appetite.
Since there are no known pre-existing medical conditions, we can rule out those as a cause for the lack of appetite. However, internal issues such as gastrointestinal upset, infections, or organ dysfunction can arise without prior symptoms. Watch for signs of discomfort, changes in bowel movements, vomiting, or lethargy.