A greyhound, écorché. Chalk drawing attributed to J.F. Lewis. https://www.rawpixel.com/image/13953687/greyhound-ecorche-chalk-drawing-attributed-jf-lewisFree Image from public domain licensePolar bears playing with each other. Free public domain CC0 photo. https://www.rawpixel.com/image/6033227/photo-image-background-public-domain-natureFree Image from public domain licenseBear's face closeup, wild animal background. Free public domain CC0 photo. https://www.rawpixel.com/image/6041388/photo-image-background-face-public-domainFree Image from public domain licenseTwo wild cats in a mountainous landscape. Coloured lithograph by B. Hummel after J. Stewart. https://www.rawpixel.com/image/13952423/image-cat-cartoon-plantFree Image from public domain licenseA pug wrapped in a blanket on a bed. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305094/free-photo-image-bulldog-dog-pugFree Image from public domain licenseLeopard animal walking in wilderness. Free public domain CC0 photo. https://www.rawpixel.com/image/6021494/photo-image-background-public-domain-patternFree Image from public domain licenseA shepherd's dog standing in front of a mountainous landscape populated by sheep. Etching by J. Scott after P. Reinagle. https://www.rawpixel.com/image/14004868/image-dog-art-mountainFree Image from public domain licenseSmiling crocodile clipart, animal cartoon illustration. Free public domain CC0 image. https://www.rawpixel.com/image/6483648/image-public-domain-green-illustrationsFree Image from public domain licenseKoala sleeping on a tree branch. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284343/free-photo-image-sleeping-koala-natureFree Image from public domain licenseRennende hond, mogelijk een spaniël (1684) by Jan Verkolje I and Jan Verkolje I https://www.rawpixel.com/image/13764573/rennende-hond-mogelijk-een-spaniel-1684-jan-verkolje-and-jan-verkoljeFree Image from public domain licenseTwo antelope facing the camera amongst brush and downed trees with mountains in the background. Original public domain image… https://www.rawpixel.com/image/3302385/free-photo-image-deer-animal-antelopeFree Image from public domain licenseA pitbull laying on a green carpet under a table in Bel Air, Maryland, United States. Original public domain image from… https://www.rawpixel.com/image/3284790/free-photo-image-dog-cute-carpetFree Image from public domain licenseA dog chasing a cat through a window. Etching by W. R. Smith after J. Pitman. https://www.rawpixel.com/image/13972939/dog-chasing-cat-through-window-etching-smith-after-pitmanFree Image from public domain licenseJellyfish on black background. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297574/free-photo-image-jellyfish-animal-cc0Free Image from public domain licenseStarfish under the reflecting water. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3299018/free-photo-image-oil-pattern-fractal-mineralFree Image from public domain licenseFree elk with big horns in meadow photo, public domain animal CC0 image. https://www.rawpixel.com/image/5906105/photo-image-public-domain-green-natureFree Image from public domain licenseFree close up of a cow's head with bell image, public domain animal CC0 photo. https://www.rawpixel.com/image/5910540/photo-image-background-public-domain-natureFree Image from public domain licenseA mastiff. Wood engraving by Butterworth and Heath after T. W. Wood. https://www.rawpixel.com/image/13962479/mastiff-wood-engraving-butterworth-and-heath-after-woodFree Image from public domain licenseGeschoren hond liggend naar rechts (1803) by Monogrammist JBM https://www.rawpixel.com/image/13783269/geschoren-hond-liggend-naar-rechts-1803-monogrammist-jbmFree Image from public domain licenseCocker spaniel playing in grass. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286727/free-photo-image-dog-playing-animal-brownFree Image from public domain licenseWhite dog with party hat. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284878/free-photo-image-birthday-dog-pinkFree Image from public domain licenseFour dogs: Above, a Makenzie River dog and a Esquimaux dog, below, a Thibet dog and a Wild Indian dog. Coloured etching by… https://www.rawpixel.com/image/13951403/image-dog-art-animalFree Image from public domain licenseClose-up of a blue-eyed cat lying on the sofa and looking at the camera. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3297050/free-photo-image-kitten-animal-catFree Image from public domain licenseLiggend ovaal met putto (1573 - 1610) by Christoph Jamnitzer, Christoph Jamnitzer and Christoph Jamnitzer https://www.rawpixel.com/image/13769663/image-paper-cartoon-faceFree Image from public domain licenseA bull, with parts of the body indicated and numbered: the numbers forming a border around the image. Woodcut, 17--. https://www.rawpixel.com/image/13968834/image-paper-border-cartoonFree Image from public domain licenseIguana side profile, close up. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3304366/free-photo-image-nature-animal-animals-images-picturesFree Image from public domain licenseFree bull cow licking its nose image, public domain animal CC0 photo. https://www.rawpixel.com/image/5902585/photo-image-background-public-domain-greenFree Image from public domain licenseTwo circus elephants performing to a crowd by drinking and eating from a table. Coloured lithograph. https://www.rawpixel.com/image/13952416/image-cartoon-person-churchFree Image from public domain licenseTwo pointers standing rigid looking towards a hare hiding in the undergrowth of a forest. Etching by W. S. Howitt. https://www.rawpixel.com/image/13985830/image-dog-plant-treeFree Image from public domain licenseFour dogs sitting in a barn looking expectant at the door. Lithograph after E. H. Landseer. https://www.rawpixel.com/image/14015938/image-dog-art-animalFree Image from public domain licenseHonden (1628 - 1679) by anonymous, Adriaen Collaert and Nicolaes Visscher I https://www.rawpixel.com/image/13779468/honden-1628-1679-anonymous-adriaen-collaert-and-nicolaes-visscherFree Image from public domain license