Dog sick after flea treatment: hair loss, sores, lethargy. What to do?

Poor Paisley! It could be she has a skin infection or she has mange. Skin scrapings of the area may be a good idea, or a course of antibiotics. I'd take her back into the vet in the morning. I hope this helps!

Oh dear, poor Peanut! Some dogs are allergic to fleas and can actually develop bacterial skin infections as a result of ongoing scratching and licking. The first two photos look most suspicious for signs of a skin infection, but the third photo looks more suspicious for a raised benign or malignant mass. I'm glad that you're planning on taking Peanut to his vet when it is financially feasible for you. In the meantime, make sure that all pets in your house have been treated with a high quality flea preventative, such as Nexgard, Bravecto, or K9 Advantix II (or Advantage, Revolution, or Bravecto for cats if you also have cats in the house). You can also give your dogs a dose of oral Capstar ( http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=10902 ) to rapidly kill adult fleas in addition to the flea preventatives mentioned previously. Be sure to use these flea preventatives regularly without missing doses to break the flea life cycle! For Peanut's irritated skin, you can try bathing him in a medicated antimicrobial/anti-itch shampoo ( http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=27981 ). Hydrogen peroxide can actually delay skin healing, so I would avoid further use since it is likely to cause more irritation. I hope this helps and that all goes well!

It is hard to say what is causing Bacardi's problems. The third picture you included looks like pus, which would indicate infection and would need antibiotics to treat. Some dogs can be allergic to fleas, and it may only take 1 bite to make them itchy all over. If you are seeing scabs from where you applied a flea medication or flea collar, it may be irritating the skin so I would recommend removing it and bathing with dog shampoo thoroughly. Causes of itching in dogs include fleas or flea allergies, mites, or skin infection. The hair in the second picture looks like normal shedding to me, but if you feel it is weird for Bacardi, it could be caused by inflammation or from the extra itching she is doing right now. You can try a shampoo like Dechra MalAcetic Ultra Shampoo, but if it doesn't respond in a day or two, Bacardi should be seen by a vet as she may need oral medications to control the itching.

Fleas and allergies to fleas can set-up an environment for infection. It's possible that this is complicating the recovery process. The skin will often start to heal once the fleas are gone, but it's worth treating for infection by giving a bath with a medicated dog shampoo (can get this at the pet store). It's best to just give a bath with the medicated shampoo once every 2-3 days, until the skin starts to look normal. It's expected that it will take a month or more until Buddy starts to look normal again, so stick with it and he should get through this fine. Treating for fleas is not just restricted to the host, because fleas can reproduce and nest in the environment and continually cause an issue. Below is a link to a short article that explains treating the dog and environment for fleas: https://www.petcoach.co/article/5-tips-to-get-rid-of-fleas/ If the skin problems are not getting better, or are getting worse in the next two weeks, then it's best to have Buddy evaluated by a vet, because he may need additional treatment. I hope that helps and buddy gets better soon.

Flea infestation and scratching because of it can cause the hair to fall out. However, mite infection (mange can also cause hairloss and vigorous scratching. I suggest you take Spade to a veterinarian to determine whether Spade has mange mites. Treatment for those is easy: Bravecto will kill them as well as fleas and ticks and will last a few months. Your vet may recommend another medication. Please make an appointment with your veterinarian. Apart from that here is the recipe for getting rid of fleas: Unfortunately fleas only hop on the body of your pet when they want to feed, then they hop off again and stay in your pet's environment. So you need to treat all pets in the household as well as the environment (which contains the fleas, their eggs and larvae). Flea treatment:  1) Get some flea medication such as a Flea spray or a spot on or chew from a pet shop or your veterinarian and apply monthly 2) get flea powder, put some in your vacuum cleaner bag and vacuum your house and furniture and also non-carpeted areas frequently to remove flea larvae and eggs which live off house dust., Dispose of the bag in the trash outside. Hot-wash all the pet's bedding, If you do this diligently for a few months you will get rid of the fleas.

When you have a heavy flea infestation, you also have to disinfect the environment as well. Wash theirs 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. Dogs who have heavy flea infestations can also develop flea allergies, which would lead them to continue to be itchy and may affect the fur growing back. I would take them both back into the vet, and the vet can discuss if they do have flea allergies and how to treat them. Tonight, give them baths in Epsom salts or oatmeal, as it may help temporarily with the itching. Tomorrow, I'd take them into the vet. Good luck, I hope this helps!

I recommend you get him checked by your vet - it is likely the damaged skin has become infected and very painful, hence the biting and snapping towards the area. It is likely he will need antibacterial and antifungal washes and possibly antiinflammatory medication to allow the skin to heal. An omega fatty acid supplement and rigorous flea prevention (including household flea spray to kill the eggs and larvae) are also recommended