toeless

so this is yoshi! i rescued him about 3 years ago now, when i got him he was missing a toe on one of his back feet, it doesn’t bother him at all but i was just wondering if it looks like he was born without it, or its from an injury from when he was young, he was about 3 when i rescued him so he’s roughly 6/7 years old now, if anyone knows what could cause this pls let me know as im intrigued, thank you!