I can provide a detailed answer to the question about whether Jack Russells have rear dewclaws. From my personal experience and knowledge, Jack Russell Terriers typically only have dewclaws on their front legs. These dewclaws are the small, extra toes located on the inside of the leg, slightly above the paw.
Unlike some other dog breeds, the dewclaws on Jack Russells are usually more firmly attached to their legs. This means that the dewclaws on their front legs are less likely to be loose or easily injured. The purpose of dewclaws in dogs is still a topic of debate among experts, but they are generally believed to have some functions related to gripping, stability, and climbing.
However, it is important to note that not all Jack Russells have dewclaws on their front legs. Some may be born without them or may have them removed for various reasons such as preventing injuries or conforming to breed standards for show dogs. Additionally, there may be rare cases where a Jack Russell has rear dewclaws, but these instances are not common.
In my experience with Jack Russells, I have owned and interacted with several of these energetic and intelligent dogs. None of them have had rear dewclaws. Their rear legs have been similar to those of most other dog breeds, with no extra toes or dewclaws present.
To summarize, Jack Russell Terriers typically do not have rear dewclaws. Their front dewclaws are usually more firmly attached to their legs than the ones on their hind legs. However, it is important to remember that individual dogs may vary, and there may be rare cases where a Jack Russell does have rear dewclaws.