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Suddenly bald patch, then the skin ‘broke’ and vanished like eaten daily by bacteria or fungi; given fipronil drops which I found is a dewormer
From the photo, the dog's bald patch is likely fungal infection or folliculitis; try diluted alcohol and erythromycin ointment with an Elizabethan collar. If no relief, see a vet.
Where can I buy fipronil; is it available at regular human pharmacies?
Fipronil is not sold in regular human pharmacies; it is usually available at veterinary clinics and online pet pharmacies. It is a broad-spectrum insecticide for fleas, ticks, and other external parasites on dogs and cats; if ingested it is toxic to people and animals, so it is sold only as a topical drop and must never be taken by mouth. Common fipronil-based external parasite products include spot-on drops and sprays.
My cat licked fipronil flea medicine and foamed at the mouth, will it die?
Licking fipronil flea medicine can poison a cat and be life-threatening; a small amount may be broken down by immunity, but larger amounts without treatment cause violent vomiting, seizures, and lethargy. Chronic signs are poor appetite, lethargy, weight loss, so see a vet and run liver and kidney tests. Apply topical medicine along a line on the skin; if it lands elsewhere, use an Elizabethan collar to prevent licking.

Why Your Cat Keeps Retching
Repeated retching means something is wrong — most often a hairball, a swallowed foreign object, or gut parasites. Expel hairballs with paste, get any stuck object removed by a vet, and deworm on schedule to keep parasites off the table.

How to Remove Ticks from Your Cat
Ticks cause anaemia, fever, breathing trouble, and jaundice in cats, and inject toxins that trigger nerve signs — and they can carry diseases such as cytauxzoonosis. Remove them only after killing them with a fipronil/methoprene spot-on (dosed by weight) or a mite-killing medicated bath, since pulling a live tick leaves its mouthparts embedded; disinfect the bite afterward and recheck the blood later.

Why Does a Dog Keep Scratching?
Frequent scratching usually means something is wrong with the skin: over-bathing or human shampoo, fleas and lice, healing wounds, allergic dermatitis, or eczema from bacterial, fungal, or mite infection. Bathe every 2–4 weeks with pet shampoo, deworm monthly (ivermectin or fipronil outside, albendazole inside), fit an Elizabethan collar on healing wounds, and use chlorpheniramine plus a skin spray for allergies. Small areas of eczema can be treated topically; otherwise see a vet.

Pet Skin Diseases (Part 1): Parasitic and Fungal Infections
Skin disease is common in dogs and cats and tends to flare up and recur, usually because their skin defenses are weak and their surroundings are full of triggers. The two hardest types to clear are external-parasite infestations (fleas, lice, mites, ticks) and fungal infections (ringworm); both cause intense itching, hair loss, and skin damage and need treatment of both pet and environment. Since they are contagious and slow to resolve, early veterinary care and consistent parasite control are the keys to recovery.

How Long to Wait After a Bath Before Deworming Your Cat
Wait 3–4 days after a bath before applying a topical dewormer, because washing strips the skin oils the medication needs to be absorbed through the sebaceous glands. Internal deworming is unaffected and can be done right away. Deworm healthy adult cats monthly (topical) and every three months (internal), and avoid baths around treatment.

Why Dogs Get Small Hard Lumps Under the Skin
A small hard lump under the skin can be an unabsorbed vaccine or injection (eased with a warm compress), an insect bite (clears in days with disinfection), or a cyst or skin condition that needs a vet. Skin disease itself comes from parasites, bacteria, poor nutrition, hormone overuse, or a damp coat — treat by diagnosis, with saltwater for bacterial cases and a fipronil spray for external parasites.

How to Help Your Cat Develop Full Cheek Jowls
Full cheek jowls are a male, breed-linked trait — Sphynx, calico, Devon Rex, and Siamese cats rarely develop them, so don't overfeed a cat that won't. For cats that can, deworm monthly, feed a protein-rich diet (35%+ kibble plus meat and egg yolk), and add vitamins; skip the daily nutritional paste, which just drives obesity.