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Hi, I recently got a female jack russel from the pound. They said she was about 3 months old & healthy, however when we brought her home we noticed she was sick, so we took her to the vet, & she was given anti-biotics for "kennel cough", not sure if that's a generic term or a specific type of sickness, but anyway, her symptoms have improved, & when she's awake, she's pretty energetic, but when she sleeps, she sleeps so deep & seems lethargic. I've never known of a dog to be such a deep sleeper. Is that normal for jack Russells because they where themselves out during the day, or might she still have something wrong?