Accepted Answer

Then let's assume the problem is flea related for now.

First, the flea life cycle is approx. 3 months long, so effective flea control must be used for at least that much time. If you are using frontline (a great product) then you must apply it without question at least every 4 weeks (sometimes every 3 weeks is better) for the next 3-4 months to help rid the house and immediate property of a flea infestation. You must also make sure that every dog and cat in the home is being treated (even if the cat doesn't go outside).

Second, many dogs and cats have allergies to the flea bite itself which can cause an intense itch long after the fleas are no longer present. The itch usually involves the inner thighs, around the neck, at the lower back, and under the groin or around the anus. Sometimes, little pinpoint sores may be seen in these areas.

Third, you don't have to see fleas for them to be a problem. For every flea you see, there are usually 10 you don't and even a few sporadic flea bites can elicit an intense itch. So if fleas have been seen within the last 1-2 months, assume they are still around and be patient and religious with your flea control use.

Fourth, other causes of itching can mimic flea related causes and can include allergies to weeds, pollens, certain fabrics, etc. but I would have expected a history of itch within the previous 2 years of ownership. Mange or other skin parasites are also a possibility, especially if she has been in contact with younger dogs lately or visited parks where other dogs frequent. A vet exam is often needed to determine this.

 

Now what you can try at home.

Over-the-counter Benedryl (Diphenhydramine HCl) is a safe antihistamine that can be used for dogs. The dose is 1 mg per pound of weight, so an average 50 lb dog could have 50 mg of Benedryl and a 75 lb dog could have 75 mg of Benedryl. Since most Benedryl comes in 25 mg strength, you would have to give 2 up to 3 capsules at a time up to twice a day. The only side effects that I see is some drowsiness and this is usually at the higher dose range. Some dogs can be allergic to any drug so any adverse effects that worry you should be addressed immediately but this is very rare. Continue with the bathing but use a hypoallergenic shampoo or even an oatmeal based shampoo designed for sensitive skin found at your petstore. Avoid flea shampoo at this time if you are using frontline since you will simply dry out the skin and increase the itch.

You can use cortisone sprays found at your petstore or at the drug store for areas that seem the most intense but do not spray the whole dog or soak the dog in cortisone spray.

If these hints don't help, the next step is likely an exam so the vet can determine if antibiotics or if specific skin testing is necessary. The vet may also take advantage of injectable cortisone for greater effect of various itch intensities but only after your dog is deemed healthy enough to tolerate cortisone therapy if recommended.

 

Hope this helps,

SoCalPetDoc