I'm my axolotl's third owner (that I know of)
I've had my 2 for almost 4 months.
When they first came to me, neither had 'perfect feet'.
In 4 months, they now have 2/8 perfect feet (one each) due to their amazing regenerational abilities/adaptations. The other 6 feet have not changed since that day I got them (so I highly doubt that they are nibbling each other's toes off).
To name a name a few imperfections, one foot has 2 toes only, another foot has 7 with one toe at 90 degrees to the others.
So I wouldn't worry about it
I hope my post makes sense, cause I tend to waffle (umm...waffles :lick
when I can't perfectly describe what I mean. Also, it's not helping is that it's 12.34am here and I need sleep.