Excessive vocalization, which widely-known as whining or barking, can be a sign of several thing. Pain is definitely one of them. However, it’s not the sole probable cause of whining.
Usually, the cause of whining is acute or sudden pain like when a dog suffers after a surgery, when a dog is bloating or when a dog’s limb is broken. However chronic pain does not cause dogs to whine such as that experienced with arthritis.
Except if you’re seeing some symptoms of pain -- like limping, poor appetite, guarding a painful body part, panting or hiding – then it is unlikely that pain is contributing to the whining of your dog.
Some probably causes include anxiety, excitement, glandular or metabolic disruptions, neurological substances, exposure to toxic substance, and cognitive changes. The whining from excitement, fear of anxiety and exposure to toxins is typically temporary, and it stops the moment the stimulus that causes it is detached. If your dog happens to whine continuously then it is possible that one of these causes is his problem.
That leaves glandular or metabolic irregularities, cognitive and neurological problems change. Cognitive change is just another way of saying deteriorating mental function, which is also called dementia.
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