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Hello! My name is***** and I would like to help with your questions today. Based on what you describe, my primary concern is with the anal glands.
These are two little glands inside the dog's rectum. They naturally fill with a material that ranges from thin, light colored liquid to a thick paste. When a dog defecated, this material is released -- most of the time not all of the liquid is release but over the course of each defecation, enough is released that the glands do not overfill. With some dogs though, this process does not occur as easily. This can be due to the material being too thick to be expressed, the stool being too soft or diarrhea which does not apply enough force to the gland to express the fluids or due to an underlying disease process. The most common cause of recurrently full anal glands is an underlying allergy problem. Dogs with skin sensitivity or allergies often have anal glands that need to be emptied on a routine basis. If the glands become too full, the material can become infected or the gland can rupture. In this case, the area will heal but antibiotics are typically needed. After the anal glands are expressed, the area can continue to feel irritating for a few days. In some cases though, the glands may not have been completely emptied. This is often the case if the glands are emptied at a groomers as they empty them from the outside and are not trained to empty them rectally as a vet would. Most dogs do not need their glands emptied for any medical purpose but if the glands were randomly checked, they could be moderately full. This does not indicate a need to express the material though. The reason I bring this up is because I have found that if we begin emptying the glands for the dog, it creates a cyclic effect where we continue to have to empty them. If the dog is scooting, this is an indication to have them checked though as you did. After reviewing this, please let me know what further questions I can assist with today.
Yes, it can cause difficulty with his tail due to the sensitivity in the area. It would be best to have his glands checked to be sure there are not full and expressed if needed. If they are not full, the vet can then evaluate the tail specifically for any injury. the tail can be broken or sprained just like a limb and your dog would then be limited with its movement of it. Typically an anti-inflammatory is prescribed and healing takes about a week if that is what is going on.
You typically will not notice spots unless the gland has already ruptured. You would also be able to see this if you look at his rear end though. You may or may not notice a distinct odor. As far as allergies, yes, dogs with allergies do tend to have anal gland troubles since the glands are a connection to the skin. In the future, I would have the glands checked every 6 months, sooner if you notice any scooting or licking back there.