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barking | chewing | digging | hyperactivity | jumping up on people | leg humping | nipping | tail chasing | accidents | cleft palate | eating grass | eating sporadically | eating feces (stool or poop) | hernia | herpesvirus infection | losing teeth | low blood sugar (hypoglycemia) | navel (umbilical) infections | parvovirus (parvo) | scooting on their rear-end | sleeping a lot | ticks and fleas | upset stomach (gastritis) | worms (internal parasites)