Welcome to the website Jrtmy.info
Remember the famous saying, "A little doggie is a puppy to death"? That sounds like it says something about your Jack. This restless, cheerful little guy just doesn't want to be an adult.
By old age, Jack, like any living organism, has a lower metabolic rate, and therefore the number of calories burned should be lower.
Older Jack is used to a certain way of life, try not to change it. Don't make drastic changes in the apartment, don't change your walking routes, don't take Jack to unfamiliar places.
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This site is not only about Jack Russell (Parson) dogs. The site will help you better understand your dog. Separate sections are devoted to the care, feeding rules, health care of your dog.
You will learn how the breed appeared and developed, about individual character traits that are unique to it and the rules of education and training arising from them.