if you have dog that bites,no way they should ever be around small kids up to about 18 years old..
you are dealing with a DOMANIANT dog or one that has FEAR AGGRESSION or both..

here is story on mine today.. my mother died and ambulance came.my dog is deathly afraid of anyone in a uniform or company vehicile..

today i had store man arrive,i asked him if we could try to break my dog of this.
he was willing, i said dont touch his mouth,UNLESS I OK IT.

WELL, he came in home ,my dog was outside...
he went back out and my dog was on steps not letting him by, he puffed up, hair up and showed his upper teeth..

the repairman said in firm voice,STOP THAT and go get your ball..

well, my dog ran off, grabbed ball, and brought it to him, he even left him take ball out of his mouth...
he even licked repairmans bald head..

BUT,if repairman would have acted timid and reached his hand down, dog would possibly bit..

this is only way i know to correct a dog like this, person he is afraid of must show DOMANANCE,a kid cant do it ,so you must keep small kid away from dog that has this problem..