No, it is not normal for a senior dog to suddenly lose a lot of weight. This is especially true if your dog looks truly underweight (such as through ribs and vertebrae showing as well as having visible hip bones). While weight loss is a common symptom in aging dogs, it should never be ignored.
Why is my old dog getting so skinny?
Changes in their hormones with age can change the way the body generates energy. This could leave them being naturally leaner. However, when older dogs lose weight, it could also be a symptom of a medical condition they become more prone to when they are older, such as diabetes, heart disease, or dental disease.
Why is my elderly dog losing weight but still eating?
A dog who loses weight but still seems to be eating and drinking as much as before might need a visit to the veterinarian, too. "They're not taking in enough calories to support themselves," says Shawn Finch, DVM, with Gentle Doctor Animal Hospitals in Omaha, Neb.
Do dogs get skinnier as they age?
What happens during ageing? As the body slows down, it uses less energy, so the tendency to deposit fat is increased. It is the time of life when those little treats start to catch up! Some dogs lose weight due to poor digestion or illness (always consult your vet if your dog is losing weight).
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