Now that i start adding some dogs again, just 2 things i would personally find helpful.
1. is leaving land of birth and country open or unknown instead of USA. lot of times i dont know the land of standing or i dont want to put the land of standing, takes time changing them so what i think most people will do is just leave it on USA. Did it a few times also, will correct them later.
2. if there would be 3 different boxes for month/day and year, preferably if u can just select the number. This will reduce the ammount of mistake there big time.

Cheers