It depends on the age of the child, if they know how to behave around dogs (e.g., don't look them face to face eye to eye, don't poke them with sticks, don't pull their tails or ears, etc.), and the...
Make a Punnett Square. (: You do not know if the mother is heterozygous or homozygous for type A, though, so you'll probably have to make 2. If the mother was homozygous.. A AA AA AAB AB AB50% chance...