Every photograph, credited

Real micrographs only. Each field below lists its author, source page and license; every image is used under a license that allows it (CC0, public domain, CC BY, CC BY-SA or copyrighted-free-use). No plate photograph or microscope field is AI-generated or inpainted. The decorative scene images listed at the end are AI illustrations of setting and technique, labelled on every page where they appear.

No photo plates have shipped yet; every plate today is typographic. Photo credits appear here as photographs pass photo review.

Microscope Masterclass fields

• blood-babesia-dog field 1 — Dog blood film, oil: a pair of large pear-shaped Babesia canis piroplasms inside one red cell. Scan the feathered edge too — parasites concentrate there. — Schäfer I et al. (CC BY 4.0) Fig. 1. — Treatment failure in a dog with acute Babesia canis infection using lower-range therapeutic doses of imidocarb dipropionate. · adapted: cropped and resized; labels added
• blood-babesia-dog field 2 — Red fox blood film: one red cell holds four large pear-shaped Babesia canis piroplasms (a dividing form) — the same large Babesia that infects dogs. Host chip: fox. — Adaszek Ł et al. (CC BY 4.0) Fig. 1. — Clinical form of babesiosis caused by Babesia canis in Polish foxes (Vulpes vulpes). · adapted: cropped and resized; labels added
• blood-mycoplasma-cat field 1 — Cat blood film: tiny dark epicellular hemoplasma bodies on red cells — singly, in a line along the margin, or covering a whole cell. — Nr387241 (CC BY-SA 3.0) M. haemofelis IP2011.jpg · adapted: cropped and resized; labels added
• blood-normal-dog field 1 — Healthy dog blood film, Wright stain, oil: the monolayer — red cells lie side by side without overlapping, each with a pale center (central pallor). Slight variation in cell size is normal in healthy dogs. This is the zone where red-cell shape and color are read. — Montoya-Navarrete AL et al. (CC BY 4.0) Light microscopy smears healthy dogs at 100 × (01).jpg · adapted: cropped and resized; labels added
• blood-rouleaux-agglutination field 1 — Cat blood film: red cells stacked like coins in short chains (rouleaux). Some rouleaux is normal in cats; agglutination is different — grape-cluster clumps that stay clumped in saline. — Masucci M et al. (CC BY 4.0) Figure 1. — Comparison of Westergren and Automated Erythrocyte Sedimentation Rate Measurements in Dogs and Cats. · adapted: cropped and resized; labels added
• ear-cocci-rods field 1 — Suppurative bacterial otitis: large numbers of rod-shaped bacteria with neutrophils, and one cell packed with phagocytosed rods — true infection. Rods point to the culture pathway, not just ear cleaning. — Yoon JS, Park J (CC BY 4.0) Figure 1. — Non-invasive evaluation of cytokine expression using the cerumen of dogs with otitis externa. · adapted: cropped and resized; labels added
• ear-malassezia field 1 — Oil field from a dog with ceruminous Malassezia otitis: dozens of small oval budding yeasts on keratin and flat squames — far above the cut-off. — Yoon JS, Park J (CC BY 4.0) Figure 1. — Non-invasive evaluation of cytokine expression using the cerumen of dogs with otitis externa. · adapted: cropped and resized; labels added
• ear-otodectes field 1 — Whole Otodectes mite with long legs among dark ear debris. One mite or one egg is diagnostic. — Joel Mills (CC BY-SA 3.0) Ear mite 1.JPG · adapted: cropped and resized; labels added
• ear-otodectes field 2 — Cat ear debris in oil: several mites around a lump of coffee-ground cerumen. Scan the whole preparation at low power before you call it negative. — self (CC BY-SA 3.0) Otodectes cynotis.jpg · adapted: cropped and resized; labels added
• fna-carcinoma-cluster field 1 — Dog anal sac adenocarcinoma: cohesive sheet, indistinct borders, fairly uniform round nuclei. It often looks deceptively bland — site and pattern carry the read, histopathology confirms. — Joel Mills (CC BY-SA 3.0) Anal sac adenocarcinoma cytology.JPG · adapted: cropped and resized; labels added
• fna-carcinoma-cluster field 2 — Dog mammary tumor aspirate: cohesive epithelial cluster with shared cell borders and mild variation in cell and nuclear size — count the criteria of malignancy in a well-preserved area. — Cavalcante KF et al. (CC BY 4.0) FIGURE 2. — Cytologic Grading of Canine Mammary Tumors by Robinson's System Adapted to Romanowsky-Type Rapid Staining: Prognostic Implications. · adapted: cropped and resized; labels added
• fna-histiocytoma field 1 — Fine-needle aspirate: uniform round cells with pale cytoplasm and round-to-indented nuclei — uniformity is the teaching point. — Joel Mills (CC BY-SA 3.0) Canine histiocytoma cytology.JPG · adapted: cropped and resized; labels added
• fna-lymphoma-node field 1 — Lymph-node aspirate: a monotonous population of large lymphoblasts — one cell type, not the mixed population of a reactive node. — Joel Mills (CC BY-SA 3.0) Canine lymphoma 1.JPG · adapted: cropped and resized; labels added
• fna-mast-cell field 1 — Fine-needle aspirate packed with granulated mast cells, with free purple granules in the background. — RigInScience (CC BY 4.0) Dog mast cell tumor cytology.jpg · adapted: cropped and resized; labels added
• fna-spindle-sarcoma field 1 — Perianal hemangiosarcoma aspirate: plump spindle-shaped neoplastic cells with oval nuclei among red-cell clumps — real sarcoma cells are often plumper than the textbook picture. — Choi EW (CC BY 4.0) Fig. 1. — Deep dermal and subcutaneous canine hemangiosarcoma in the perianal area: diagnosis of perianal mass in a dog. · adapted: cropped and resized; labels added
• fna-spindle-sarcoma field 2 — Vertebral chondrosarcoma aspirate: mesenchymal spindle and polygonal cells lying in chondroid matrix. Sparse cells in pink matrix are the pattern; repair fibroblasts are the mimic. — Ho L et al. (CC BY 4.0) Figure 2. — Case Report: Surgical resection of high-grade extradural thoracic vertebral chondrosarcoma in a dog. · adapted: cropped and resized; labels added
• urine-biurate-mono field 1 — Urine sediment at very high power: oval (hemp-seed) calcium oxalate monohydrate crystals with a thick double outline. In a dog, monohydrate crystalluria flags ethylene glycol until proven otherwise. Species not stated in the source — crystal and cast shapes do not depend on species. — Ajay Kumar Chaurasiya (CC BY-SA 4.0) Calcium Oxalate Monohydrate Crystals in Urine Microscopy.jpg · adapted: cropped and resized; labels added
• urine-biurate-mono field 2 — Wider sediment field from an automated urine analyzer: dumbbell-shaped and clumped calcium oxalate monohydrate crystals, one dihydrate envelope for contrast, and red cells for scale. Species not stated in the source — crystal and cast shapes do not depend on species. — Doruk Salancı (CC BY-SA 3.0) Calcium oxalate crystals (urine) - kalsiyum oksalat kristalleri (idrar) - 02.png · adapted: cropped and resized; labels added
• urine-biurate-mono field 3 — Brown ammonium biurate spheres, single and paired, with short spicules on the rim — the thorn-apple family. In dogs they point to a liver shunt — or to a Dalmatian or Bulldog, which can form them without one. Species not stated in the source — crystal and cast shapes do not depend on species. — Ajay Kumar Chaurasiya (CC BY-SA 4.0) Ammonium biurate crystals in urine.jpg · adapted: cropped and resized; labels added
• urine-casts field 1 — Cylindrical granular casts, molded in the renal tubules — the granules are degenerating cells inside the cast matrix. Species not stated in the source — crystal and cast shapes do not depend on species. — Ajay Kumar Chaurasiya (CC BY 4.0) Granular Casts in Urine Microscopy.jpg · adapted: cropped and resized; labels added
• urine-casts field 2 — Cellular cast packed with white cells. Casts form only in the tubules, so any cast points at the kidney, not the bladder. Species not stated in the source — crystal and cast shapes do not depend on species. — Ajay Kumar Chaurasiya (CC BY-SA 4.0) WBC cast in urine.jpg · adapted: cropped and resized; labels added
• urine-cystine-bilirubin field 1 — Canine urine sediment: flat colorless cystine hexagons, some stacked. Cystine crystals mean cystinuria — a metabolic finding, not an infection. — Lance Wheeler (CC BY-SA 4.0) Cystine Crystals in Canine Urine Sediment.jpg · adapted: cropped and resized; labels added
• urine-struvite-caox field 1 — Dog urine sediment: many colorless struvite crystals — rectangular coffin-lid prisms with beveled, three-dimensional ends. — Joel Mills (CC BY-SA 3.0) Struvite crystals dog 1.JPG · adapted: cropped and resized; labels added
• urine-struvite-caox field 2 — Urine sediment: small colorless envelope-shaped calcium oxalate dihydrate crystals, each with an X across the face. Species not stated in the source — crystal and cast shapes do not depend on species. — Ajay Kumar Chaurasiya (CC BY-SA 4.0) Calcium oxalate crystals in Urine Microscopy.jpg · adapted: cropped and resized; labels added

AI scene images

• Home page header — A veterinary laboratory bench at golden hour with a microscope and a slide box, a dog and a cat resting far behind (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 1 card and lesson banner — Technician's gloved hand holding a blood-smear slide up to the window light beside a laboratory analyzer (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 2 card and lesson banner — A freshly made blood smear drying on the bench beside clean glass slides (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 3 card and lesson banner — A microscope objective lowered onto a stained slide with a glint of immersion oil (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 4 card and lesson banner — A gloved hand expelling an aspirate droplet from a fine needle onto a glass slide, a calm dog resting behind (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 5 card and lesson banner — Capped sample tubes with straw-yellow fluid in a rack, a centrifuge blurred behind (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 6 card and lesson banner — A urine sample cup, a reagent test strip and a refractometer on a bench in morning light (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 7 card and lesson banner — A capped blood-gas syringe on a tray beside a chemistry analyzer (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Module 8 card and lesson banner — An insulated courier box packed with cold packs and sealed sample tubes for a reference laboratory (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)
• Masterclass page band — A veterinarian looking through a microscope at dusk in a quiet laboratory (AI illustration by GlobalVet (Higgsfield) — setting and technique only, never clinical evidence)