The first time he came to visit, he saw Pepper and jumped into his foster mum's arms and bawled. She calmed him down, and we avoided her for the rest of the visit. When we came to live with us, which was only 4 or so days later, we had done as we had planned and got her training crate/cage out, so she had somewhere to retreat to and we could shut her in the kitchen and know that she was happy.
Somewhere in the next few months, the boy and the dog learnt to get along, a couple of months later and you would have thought they always belonged together. His day is not complete if he hasn't played with her, she is never happy if we are in, and he's not.
If boy-o is outside, that is where the dog is. If boy-o is playing in our conservatory, that's where the dog is. If boy-o is playing upstairs... she is lying on the top step, ready for when he will come down again. She wags for him, like no-one else. He can take toys out of her mouth, without complaint. And when we mess around and tickle him, and play rough and tumble with him, she cannot bare it...she barks and whines until we stop.
The boy and his dog... they love each other. And when he's having a bad day, she will curl up and allow him to comfort him... they adore each other.