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Red rash on dog's skin, back end and on tail.

Customer Question
Red rash on dog's skin...

Red rash on dog's skin, back end and on some of the tail. Dog itching at it.

Already Tried:
Soaking in Cool Water, Drying area and putting corn starch on irritated area.

Submitted: 8 years ago.Category: Dog Veterinary
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Answered in 5 minutes by:
9/3/2009
Dog Veterinarian: Pet Doc, Dog Veterinarian replied 8 years ago
Pet Doc
Pet Doc, Dog Veterinarian
Category: Dog Veterinary
Satisfied Customers: 7,653
Experience: Veterinarian - BVSc
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Hi there Customer,

Thank you for your question regarding your boy with a red rash on his back end and tail! There are a few possiblities as to the cause of this problem ranging from allergies to skin parasites to bacterial or yeast infections.

Firstly - you need to make sure that your dog is definitely up to date with flea control. Make sure you are using a flea product appropriate for his weight. Even though you cannot see any fleas on him doesn't mean there are one or two lurking and oftentimes this is all it takes for a dog with flea allergy dermatitis. In your boy's case it does sounds like he may have an underlying allergy of some sort with secondary infection, however this could also be caused by parasites or fungi (ringworm or yeast).

Bascially dogs are allergic to four main things - food, fleas, grasses/plants (contact allergy) or environmental allergens (canine atopy - the dog version of ezcema). I am sure you have worked through all of these with your Veterinarian, but I always like to ensure I have talked through each of these with my clients here in New Zealand. Flea allergies are avoided by strict flea control - every 3 - 4 weeks with Advantage or Advantage Multi or every 5 - 6 weeks with Frontline. You must also ensure all dogs in the household are treated at the same time. For a food allergy, you need to undertake a food trial with a 'novel protein' diet such as Hill's Z/D ultra allergen free and needs to be fed SOLELY for 3 weeks. After this time if you are seeing a change in your dog's allergy you can slowly introduce different foods week by week with the guidance of your Veterinarian. Contact allergies are best treated by avoidance of the plants that are to blame, but identifying the exact cause of a contact allergy can be very hard. A referral to a canine skin specialist may be the way to go in your dog's case for either a skin patch test or a blood allergen test.

It is also possible your dog may have skin mites or lice as they commonly cause intense itching and irritation. These could be either Demodex (less itchy) or Sarcoptes mites (VERY itchy) and you should ensure a full Veterinary check up so that he or she can carry out a physical examination and possibly a skin scrape to check for mites and lice, as well as signs of fleas. The next step would be to double check for fungal disease (such as ringworm) and there are several tests for this including a UV light and a fungal culture. It could also be that your dog has a bad yeast problem - and a good medicated shampoo such as Malaseb may well do the trick! Again a full Vet check will be able to confirm or deny this. If after these tests there is no diagnosis, the next step would be to carry out a food trial as above.

You really should get your boy checked out further by your Vet to try and pinpoint the underlying problem of his itching. It definitely sounds as though he may have a secondary bacterial and yeast infection but the primary problem still needs to be definitively identified. For the best thing for him in the mean time, as above, is a medicated shampoo that will deal with both yeast and bacteria - Malaseb (or a similar product containing both Chlorhexidine and Miconazole) is the most ideally suited for this. This requires you to make a lather and leave this lather on for 10 minutes before washing off! For many clients this is easier said that done, but it is SO important.

Please keep in touch and let me know how you get on with your itchy boy!

Thank you and please now click ACCEPT.

Kind Regards,

Dr M D Edwards

PS: Sorry, I have just finished typing and realized you didn't say if your dog was a male or female! My apologies if he is actually a she!

Pet Doc
Pet Doc, Dog Veterinarian
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Experience: Veterinarian - BVSc
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