Why does my dog have hair loss, bald patches, pus bumps, and swelling?

Hi and thanks for posting on Petco Pet Education Center, formerly Petcoach! If this is the first time this has occurred, it may a bacterial infection. If this appears at certain times of year, it could be related to a seasonal allergy. If this has been a chronic issue and does not seem to worsen during a particular time of year, it may be due to a food allergy. Another possibilities may be a parasitic infection of the skin such as mites. I would recommend Frankie see her veterinarian soon for a work up on this skin issue. Her veterinarian may start with a skin scraping to check for parasites and may place Frankie on antibiotics or other medications such as antihistamines or other drugs to help get the inflammation down and help the skin to heal. Food trials or allergy testing may be recommended later by your veterinarian depending on whether your vet thinks it is related to an allergy. I hope this helps!

Scrappy needs to go to your veterinarian for an exam and skin scraping to determine the cause of this skin condition. It looks like a bacterial infection but he also could have mites, a fungal infection or it could be an autoimmune disease or tumors. If it's a severe bacterial infection with antibiotics and medicated baths this should improve. The longer he has these lesions the more likely the skin can become damaged and his fur may not grow back in. In addition to the skin scraping they may recommend a thyroid level test and perhaps a blood panel to check for other underlying disease. Scrappy will feel better once they get a diagnosis and the proper treatment. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Scrappy.

The bald spots and pimples may indicate minor infection or may be a symptom of a broader underlying condition. Skin problems can have a variety of causes, sometimes more than one. It is important to have the condition addressed by your veterinarian to determine if there is a medical cause for your pet’s skin issues and treat accordingly. Young dogs can get skin infections, commonly referred to as 'puppy pyoderma'. This usually occurs on the belly and inside the hind legs. This type of infection usually resolves without treatment as the puppy gets older. [*Staph* infections](https://www.petcoach.co/dog/condition/staphylococcal-pyoderma-1/) are common in dogs of all ages and may requires antibiotic therapy to treat. In pets of all ages, [fleas](https://www.petcoach.co/dog/condition/flea-allergy/), [food allergies](https://www.petcoach.co/dog/condition/food-allergies/) and [environmental allergies](https://www.petcoach.co/article/food-allergies-vs-environmental-allergies-whats-the-difference) (contact or inhaled) can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin or cause a [hot spot](https://www.petcoach.co/dog/condition/hot-spots/). Diagnosing the cause of allergies may require [allergy testing](https://www.petcoach.co/article/allergy-testing-immunotherapy-in-dogs) and [food elimination trials](https://www.petcoach.co/article/food-trials-for-allergies-in-pets-what-to-expect). [Check for fleas](https://www.petcoach.co/article/how-to-check-your-pet-for-fleas-and-ticks) with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle. If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic. Food allergies are often caused by sensitivity to a [protein in the food](https://www.petcoach.co/article/all-about-protein-in-pet-food). Hill's Science Diet offers some non-prescription options for sensitive skin as well as [prescription hypoallergenic foods](https://www.petco.com/shop/en/petcostore/category/dog/dog-food/prescription-dog-food-and-treats) for more severe cases. Royal Canin carries limited protein and [novel protein](https://www.petcoach.co/article/what-is-a-novel-protein-pet-food) diets that may also offer some relief. Your vet can recommend a specific diet that will help.

Thanks for using Petco Pet Education Center, formerly Petcoach! This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

That is an understandable concern. It appears he has a very bad case of folliculitis, which can be caused by several things including a Demodexx mite infestation, a contact allergy, environmental allergy or flea allergy. He needs to first go on a good flea preventative (Nexgard, Bravecto, etc) and then have a skin scrape/cytology done to look for possible mites. He definitely needs a short course of antibiotics to treat for his current skin infection and then medication depending on the results of his skin scrape/cytology. The vet should be able to get him on the right track if the skin testing is done. I hope this helps and best wishes with Trump moving forward. I hope his skin problems resolve very soon.

Thanks for using Petco Pet Education Center, formerly Petcoach! This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

Hello and thank you for your post! From what you are describing, it sounds as if Frankie may be dealing with a skin infection. There are multiple treatments for a skin infection. I would have your vet examine Frankie in order to determine which treatments are best for him. Frankie will most likely need a course of oral antibiotics and topical treatments to resolve this. This may also be a condition known as seborrheic dermatitis. This can lead to secondary skin infections as well. A different topical treatment is needed to treat this. Again, I would have your vet examine Frankie to determine what this is in order to start the most appropriate treatment. If you are unable to get to your vet to have him seen, you can at least start a shampoo called duoxo chlorhexidine PS combination and bathe him twice weekly until the infection resolves. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns. I am also available via consultation.