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My two-month-old dog just arrived home; at night it had diarrhea and passed worms, and vomited thin, still-moving worms.
Passing thin worms indicates internal parasite infection, likely roundworms or tapeworms, and the dog should be dewormed promptly. Tapeworms are white, flat, and strip-like in the digestive tract; roundworms are white, cylindrical, and earthworm-like, living in the small intestine.
Why do dogs get black skin disease?
The cause of black skin disease in dogs is unclear, thought to result from the combined effect of environment and genes—possibly gene mutation or defects, or environmental factors like UV, chemicals, or parasites.
My dog has large-area hair loss and is shedding frantically
Large shedding has many causes. Dogs molt twice a year (spring and autumn) in a whole-body regular pattern without itch or eczema. But local loss with itch, redness, scabs, or symmetric loss suggests fungal, bacterial, mite, nutritional, or endocrine skin disease. The photo shows large loss, redness, and scabs on the hindquarters, likely pathological from skin disease; see a vet and do not feed human food, keep coat clean.
Why does a dog pass worms without taking dewormer?
If a dog has many internal parasites, it may pass worms or eggs even without dewormer; this is a warning to deworm promptly. Without it, parasites multiply and cause greater harm, so deworm regularly for health.
My dog has been home less than ten hours, vomits after drinking water, low energy, sleeps constantly
Vomiting, sleepiness, and low energy soon after arriving can be stress from the new environment (add probiotics, adapt in about a week), or from long transport (improves next day), or infectious disease and parasites — many sold dogs are sick. If vomiting, diarrhea, lethargy, and poor appetite persist, get tested for parvovirus, distemper, coronavirus, and parasites.
Why do dogs get dermatitis?
Dog dermatitis has many causes: allergy to food, environment, pollen, or substances; infection by bacteria, fungus, or parasites; or a broken skin barrier from long moisture, frequent baths, or irritating products. Genetics, poor nutrition, and immune problems can also cause it.
My dog started vomiting on the afternoon of July 28; the first two were food, then after water it was clear fluid; by July 30 it stopped vomiting but had a little bloody stool, a drop or two each time; yesterday no blood but loose stool, no appetite, lies down a lot
Vomiting, bloody loose stool, poor appetite, and lethargy are common in digestive disease: parasites, bacterial or viral enteritis; if vaccines are incomplete, suspect parvovirus or coronavirus. See a vet for screening, fecal and blood tests; if something was eaten, rule out foreign-body blockage or perforation by X-ray and ultrasound, then treat with antivirals, antibiotics, hemostatics, anti-emetics, antidiarrheals, and fluids.
I suddenly noticed (my dog scratches its neck often and it is red and swollen)
Frequent neck scratching with redness is likely a skin disease causing itch, and over-scratching causes inflammation. Use an Elizabethan collar to stop scratching and iodine to disinfect, and an oral anti-itch medicine if very itchy. Since many skin types exist, get a scraping, stain, and allergy test at the vet to use the right medicine; common itchy rashes come from allergic dermatitis, mites, atopy, or fungus.
My dog has a coin-sized scab; after it mostly fell off the skin is still hard, the hair there thinned, and dandruff-like flakes fall off — what disease is this, urgent help
Black scabs, dandruff, and hair loss are likely from bacterial, fungal, or mite skin infection. Bacteria or fungi cause scabs and post-loss dandruff; parasites like mange mites, scabies, ticks, or fleas cause itching and folliculitis. Environment, poor care, or genetics also contribute. See a vet for scraping and use the right medicine with an Elizabethan collar.
My dog was fine this morning, but by afternoon its anus was swollen and red, with diarrhea but no blood
Diarrhea likely caused anal redness and inflammation; long diarrhea irritates and infects the skin around the anus, causing redness, pain, and even prolapse. See a vet to find the diarrhea cause. Bacterial gastroenteritis, parasites, or viral enteritis all cause diarrhea with different treatments, needing vet-guided antidiarrheal, anti-inflammatory, and gut-restoring medicine, fasting, and fluids to prevent dehydration.