Teach him to ask for his face wiped.Â
That's what my cousin did with his 3 year old bulldog. From day they got her, every time she ate or drank something, she would get her face wiped with a towel that had just a hint of some weird aromatherapy oil on it. He claims that it helps her be more calm and attentive in the house. They keep several towels scattered around, including a couple that hang on heavy refrigerator magnets, down where she can reach them and pull them down herself.
I've seen her get a towel, take it to one of the kids, they follow her to her dish. When she's finished, she holds her face up for a wipe, after which she invariably gives and receives kisses.
She'll even get a towel to be wiped if she feels slobbery. She likes a clean, dry face.Â
Teach him that a nice dry face gets hims kisses and lovies, and he'll carry his towel around with him, I bet.Â