He keeps scratching more than usual but I don’t see any fleas on him when I use the flea comb. Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 25 lbs

Scratching can be caused by various reasons such as fleas, mites ,fungal infection, bacterial infection and allergies. the first 4 needs to be ruled out before we start treating for allergies. in order to do that first de-flea Nala with a high quality flea treatment such as advantage spot on, if it doesn't help - take her to the vet in order to check for/treat the other possibilities. If everything is ruled out, then an allergy treatment can be started. Usually an hypoallergenic food is a good way to start together with anti histamines. if it doesn't help - the best solution is a medication called Apoquel which treats allergies with great success and without side effects.

There still could be fleas even if you don't see them. Fleas live in the environment, not on the dog. They jump on to feed, and then jump off. This scratching can be caused by fleas, mites, ringworm, or allergies. If Toffee isn't up to date on her flea treatment, I can give you one for her. First, I would give him Capstar. It's a one time pill that starts killing fleas within 30 minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. If she is up to date on her flea treatment, I recommend taking her into the vet for an exam today or tomorrow. The vet can do blood tests, skin scrapings, and use a Wood's lamp to diagnose allergies, mites, and ringworm. Once the cause of the itching is found, the vet can prescribe the appropriate treatment. I hope this helps!

My dog scratches but has no fleas. What's causing the itching?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 25 lbs

He keeps scratching more than usual but I don’t see any fleas on him when I use the flea comb.

4 Answers

Most Helpful Answer

Answered By Dr. Melanie, BVSc MS 102

Veterinarian

Published on August 14th, 2018

Poor King! Sometimes fleas can be hard to find, and the only evidence of them is flea dirt (little black specs that is flea poop). This scratching can be caused by fleas, mites, ringworm, or allergies. If he isn't up to date on his flea treatment, I can give you one for him. First, I would give him Capstar. It's a one time pill that starts killing fleas within 30 minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash his bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. If he is up to date on his flea treatment, I recommend taking him into the vet for an exam tomorrow. The vet can do blood tests, skin scrapings, and use a Wood's lamp to diagnose allergies, mites, and ringworm. Once the cause of the itching is found, the vet can prescribe the appropriate treatment. I hope this helps!

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My dog scratches but has no fleas. What's causing the itching?

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