6. Obesity. If they don’t have a healthy diet and enough exercise, Jack Russells can easily gain weight. Dogs who are overweight are more likely to experience joint issues, diabetes, and heart disease, among other health issues. Lethargy, respiratory issues, and excess weight are all indicators of obesity. Jack Russell Terriers, commonly known as Jack Russells, are small, spirited dogs renowned for their energy and tenacity. Despite their typically robust health, Jack Russells are prone to certain breed-specific health issues. Understanding these problems and being able to identify their early signs can ensure that your Jack Russell lives a healthy, fulfilling life. Legg-Calvé-Perthes Disease The Jack Russell lifespan is 13–16 years, which is better than the average lifespan of 10–13 years for dogs in general. At a height of 10–12 in (25.4–30.4 cm) and weighing only 9–15 lbs (4–7 kg), this is a pretty small dog. And, small dogs tend to live longer than big dogs, although experts don’t really understand why this might be. It is important to monitor their diet and ensure they maintain a healthy weight to avoid additional strain on their joints and overall well-being. Increased Susceptibility to Illness: Senior Rat Terriers may have a weaker immune system, making them more susceptible to infections, diseases, and age-related ailments. The Cojack dog is medium in size, with a long body and short legs. They normally take on a Corgi’s ears, which are tall and erect, although the ears can fold over at the top with a small minority — just as they do with a Jack Russell Terrier. Eyes are typically brown and noses are black more often than not. Appearance. The Jack Russell is a small athletic dog, full of vitality. Primarily white with black and/or tan patches, their coat comes in three different textures – smooth, broken or rough. But it’s always thick and waterproof. Size-wise, they’re slightly longer than their height at the shoulders – around 33-35cm. However, there is a possibility of a Jack-A-Poo inheriting health issues from both Jack Russell Terriers and Poodles. Most are mild, but on occasion, some can be serious. The most common issues Jack Russell stood at 12 to 14 inches tall and weighed between 13 and 17 pounds. He is always known for his brilliant mind, energy, and friendly persona. Jack Russell dogs are also known to be very independent, a strong trait heavily exhibited in the Jack Chi and one that can bring problems if not controlled. WccWdfL.