Came across an illustration in the British Library collection of public domain scanned illustrations. It was described as the boar-headed, bear-bodied, lion-tailed, six-legged beast. So here is the picture slightly modified and vectorized.
This is a completely free image Multibeast that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.