My name is Jane. I have worked with animals professionally for over 17 years dealing with both health and behavioral issues. I have over 14,000 satisfied customers. It will be my pleasure to work with you today. .
Dogs don't get hemorrhoids in the way humans do though it sounds almost like that is what you are describing. It is possible that your friend's dog has a problem with her anal glands. The anal glands are 2 sacs on either side of the anus at about the 4' o'clock and 8 o'clock positions. If your friend's dog is continually licking their anus and dragging her rear on the carpet or ground, it could also indicate that they are full. This problem can usually be resolved by emptying out the glands. To empty them or express them, your friend will want to cover the area with a tissue and press their finger on the dog's anal glands with an upward motion. A foul smelling liquid should come out. If nothing comes out and the dog appears to be in pain, your friend should take her to the Vet. The vet or a groomer usually can do this easily, as they are experienced at it.
Excellent site on anal glands
Dogs can get rectal tumors or polyps which you can read about here:
It's also possible your friend's dog may be experiencing a rectal prolapse. You can read about that here.
A Perianal Adenoma is also a possibility. You can read about this here:
It may also just be another type of lump such as a lipoma. If it is not an anal gland issue, then it will need to be checked over by a vet and possibly have a needle biopsy done to determine if it needs removal or not. If it interferes with defecation, I would definintely have it removed if possible.
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Thank you so much for the information. She favors one side with a limp and yelps when her tail is pushed downward; could these symptoms be a result of the discomfort caused by the lump?