My 3 months old puppy developed dark spots on her skin. What could that be?

I got my Chihuahua when she was 7 weeks old. She was perfectly fine. She started biting and itching herself when she turned 11 weeks that led to hair loss. Now she developed dark brownish spots on her back, but mostly on her legs and strangely on her butt! Can anyone help me? My local Vet couldn’t!!! I live in Kuwait. Unfortunately we don't have good veterinarians here.

Maybe go to a out of town vet. This bull dog I know, he licks himself so much his skin turns brown. Maybe it's sort of like that. Just try to get him to stop licking/scratching himself. I would take him to the vet that is out of town AS SOON AS YOU CAN. If you can't get him out of town soon, keep him away from other pets if you have any in case it's contageous. Watch him for a day and see if he rolls in some plants outside or gets into some cleaning products around your house. He might be allergic to the material on his pet bed or the couch he lays on. It might also be the dog food.

It sounds like your puppy has mange ,its cause by mites.Demodectic MangeDemodectic mange is caused by Demodex canis, a tiny mite that cannot be seen without the aid of a microscope. This mange strikes puppies from three to 12 months old.The demodex mite is commonly present in the pores of puppy skin and usually does not cause symptoms, and it not at all certain what causes them to activate. The mites can produce a substance that lowers the dog's resistance to them and make use of an opportunity to multiply.It's also possible that some lines of purebred dogs carry lowered resistance to the mites, and that stress can trigger an active infestation. In any case, demodectic mange symptoms include thinning of the hair around the eyes and mouth and on the front legs that evolves into patches of hair loss approximately one inch in diameter. This mange may correct itself within three months or may require treatment.However, demodectic mange can also begin as a localized infestation and develop into a generalized case with multiple hair-loss sites on the dog's head, legs, and body. This is a far more serious condition and requires veterinary attention. The dog's skin is sore, crusty, and oozing; the hair follicles are clogged with mites and debris. Treatment is extended and requires bathing in medicated shampoo and application of an insecticide to kill the mites.--------------------------------------------------------------------------------Cheyletiella mangeCheyletiella mange is also known as walking dandruff. It affects puppies and is caused by a large reddish mite that can be seen under a magnifying glass. This mange is identified by the dandruff dusting that occurs over the dog's head, neck, and back.Walking dandruff is highly contagious but short-lived. It causes mild itching. The mite that causes the mange dies a short time after leaving the host.--------------------------------------------------------------------------------Sarcoptic mangeSarcoptic mange, also known as scabies, is caused by a microscopic mite. The female mite causes the characteristic intense itching as they burrow under the skin to lay their eggs. The eggs hatch in a few days, develop into adults, and begin laying their own eggs in less than three weeks.Dogs with scabies dig and bite at themselves with great ferocity. Their skin reacts with oozing sores, and secondary infection may set in, requiring treatment with an antibiotic in addition to treatment for the mites. Unfortunately, the sarcoptic mange mite can be difficult to find in skin scrapings, and unless the veterinarian parts the hair and carefully examines the bare skin for the characteristic pin-point bite marks, diagnosis is difficult. Furthermore, the presence of a secondary skin infection can hamper the search for the mite bite marks.Telltale signs of sarcoptic mange are crusty ear tips, fierce itching, and hair loss, particularly on the ears, elbows, legs, and face in the early stages. Later on, the hair loss spreads throughout the body.Sarcoptic mange is contagious to canines and humans. If the dogs share sleeping places or if the infected dog sleeps on beds or furniture, everyone will begin scratching. It is not unheard of for the family dog to infest the kids, the kids to infest their playmates, and the playmates to infest their pets and parents with scabies. Fortunately scabies in humans is self-limiting, that is the mite can burrow under the skin and cause itching, but cannot complete its life cycle on humans and dies within a few weeks.Veterinarians now use Ivermectin in two doses, two weeks apart, to kill the mites. They may also prescribe steroids for short-term use to relieve the itching until the mites begin to die off and give the dog some relief. Itching usually begins to subside within a few days of the first dose of Ivermectin.Canine skin damaged by sarcoptic mange and secondary skin infections can take weeks or months to recover, depending on the scope of the problems. Frequent medicated baths may be necessary to soothe irritated skin.Mange damage can mimic that caused by other skin conditions, including autoimmune diseases, bacterial infections secondary to flea allergies, and contact dermatitis, making it impossible for the pet owner to diagnose with any success. If your dog suffers from irritated, itchy skin, make an appointment with the veterinarian. Early diagnosis of any of these problems will give you a head start on a cure and will be less uncomfortable for the dog and your walletWhat to Do About ItThe best treatment for mange is prevention. Regular brushing and baths will help remove scaly skin and scabs caused by mange and can help keep your dog mange-free. If your dog has been infested with mange mites, thoroughly wash his bedding or other sleeping areas. Do not try any other treatment at home until you take your dog to the vet.Signs of localized demodicosis are patchy hair loss and scaly, reddened skin around the face or on the front legs. Generalized demodicosis has similar signs, but they are widespread and more severe, being especially likely to affect the feet. To diagnose demodicosis, your vet will gently scrape off some of the superficial layers of the dog's skin and examine them under the microscope to see if mites are present. If necessary, the vet will prescribe a dip and antibiotics to ward off any secondary infections caused by scratching. Unfortunately, demodicosis is persistent and recovery isn't guaranteed, especially in older dogs.Signs of scabies are hair loss, small red bumps, and intense itching. Like demodectic mange, scabies is diagnosed through skin scrapings and treated with a weekly dip that your vet will prescribe. If your dog is diagnosed with scabies, you'll need to isolate her until her course of treatment is complete, and thoroughly clean everything she's been in contact with. Sarcoptic mange mites are extremely persistent, so other dogs in the household should also be treated, even if they don't show signs.