If you don't want to crochet (and it isn't hard and you'd probably have fun and I'm the world's biggest crochet enabler because I learned that first
) you can figure on about--and I say ABOUT--6 knitted rows in stockinette for every 4-5 single crochet. Garter stitch gets trickier, but you'll want to swatch either way. If you knit in the round, and think of the corgi as a sock, it might help.
It's harder for me to shape small items like those cute corgis in knit. It works, but it's not as easy and the finished piece won't have the structural strength of tight single crochet, so you might have to stuff the legs a bit harder to get them to stand.