Your dog is trying to indicate that he is hungry or need to go outside. Other reasons that your dog is acting that way might be because he/she is anxious and needs to be walked around. Also, sometimes when male dogs have mosqitoe bits on the scrodem they bark so that blood rushed down to the affected area and relieves the itching/burning for a short while. Because the blood gets rushed down to their genitalia area they become erect (and hard as a rock)
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