My dog, Annie has been running from room to room and attacking her backside and her back foot. When I take her for a walk she stops to lick her butt every couple feet and sometimes won’t get up to walk for an entire minute of me tugging on her. She whimpers in pain sometimes as well. I haven’t noticed anything weird in her feces or near her anus. She does this most often when she’s eating, she will take a couple bites then run to the living room and lick her anus or foot. I have had her anal glands drained at the vets office about 2 months ago. She is light colored and I have checked her entire body for fleas. I did find a tick on her chin the other day, which I promptly removed. However, this strange behavior has been going on for about 6 months. She has about 4 bowel movements a day. I feed her Beneful healthy weight dog food 1 cup twice daily and handfuls of baby carrots as treats throughout the day. She drinks a normal amount of water. Any advice would be very helpful. Thank you!