These are the best Canon lenses for pet photography, chosen for their fast and reliable autofocus, flattering rendering, useful stabilization, and focal-length coverage that handles energetic fetch sessions, calm window-light portraits, tiny-detail close-ups, and everything in between—whether you’re on RF mirrorless or adapting EF glass. Indoors and around the house, the RF 35mm f/1.8 Macro IS STM is a star: small, stabilized, close-focusing for paws, whiskers, tags, and treats, and wide enough for tight rooms without distorting faces when you keep a little distance; pair it with the RF 50mm f/1.2L USM for luminous, shallow-depth portraits (or the featherweight RF 50mm f/1.8 STM for a budget-friendly normal), and add the RF 85mm f/2 Macro IS STM for flattering compression with 0.5× detail on eyes and collars plus stabilization that helps in window light. For outdoor portraits and action, the RF 70-200mm f/2.8L IS USM is the go-to—compact, sharp, stabilized, and quick to lock on running dogs or playful cats in tall grass—while the RF 70-200mm f/4L IS USM saves weight for long park sessions; when you need more reach for off-leash runs or shy rescues, the RF 100-500mm f/4.5-7.1L IS USM tracks brilliantly with modern animal-eye AF and gives crisp frames from the sidelines, and the RF 200-800mm f/6.3-9 IS USM is a daylight-friendly option for big fields with surprising portability. A single-lens, all-day solution is the RF 24-70mm f/2.8L IS USM—fast, stabilized, and versatile for lifestyle moments, quick headshots, and candid play—while the RF 24-105mm f/4L IS USM trades a stop for extra reach and rock-solid IS; if you like prime-like separation in one body, the RF 28-70mm f/2L USM delivers creamy falloff and rich micro-contrast for premium-looking pet portraits. Detail work is where galleries come alive, and the RF 100mm f/2.8L Macro IS USM is the hero for noses, eyes, whiskers, tags, and textures—true 1:1, Hybrid IS for steady handheld close-ups, and an SA Control ring to tune blur character so fur looks soft without losing sparkle. APS-C owners can stay featherweight with the RF-S 18-150mm IS STM as a one-lens day, the RF-S 55-210mm IS STM for park reach, and the RF-S 10-18mm IS STM for tiny rooms and playful wide context. Adapting EF glass remains a smart, value-savvy path: the EF 35mm f/2 IS USM is a tiny stabilized indoor gem, the EF 50mm f/1.8 STM and EF 50mm f/1.4 USM are classic normals for home sessions, the EF 85mm f/1.8 USM and EF 85mm f/1.4L IS USM flatter faces and fluff, the EF 70-200mm f/2.8L IS II/III and EF 70-200mm f/4L IS II are proven park performers, the EF 100-400mm f/4.5-5.6L IS II USM is excellent for long throws, and the EF 100mm f/2.8L Macro IS USM mirrors the RF macro’s reliability for close-ups. Technique turns these lenses into keepers: enable animal-detection eye AF with a small tracking zone, map back-button focus so you can recompose while holding lock, and use burst mode for peak jumps and shakes; start around 1/1000–1/2000 s outdoors for sprints, 1/500 s for moderate motion, and 1/160–1/250 s for calm indoor portraits, running Auto ISO with a sensible ceiling and exposure compensation for dark fur; shoot primes at f/1.8–f/2.8 for portraits (stop to f/2.8–f/4 if you want both eyes and nose sharp), and keep IS on for handheld ambient shots but off on a locked tripod. Get low to their eye level, give a little working distance with 85–200mm outdoors to keep expressions natural, avoid extreme wide angles inches from the snout, and use squeakers/treats behind the lens to pull gaze; a circular polarizer on filter-friendly lenses can tame glass reflections and wet fur glare, and a slim VND helps video at a 180° shutter in bright parks. Simple, high-impact RF kits look like RF 35mm f/1.8 for home stories, RF 85mm f/2 for flattering portraits and details, and RF 70-200mm f/2.8 for action; swap the tele for RF 100-500mm when you need distance, or add RF 100mm f/2.8L Macro to elevate close-ups. Whether you’re capturing couch cuddles, backyard zoomies, studio-clean headshots, or rescue features for adoption, Canon’s small stabilized primes, fast standards, long teles, and true macros deliver the speed, focus confidence, and rendering that make pets look as joyful and lovable in photos as they are in real life.