is it okay if a dog licks a baby's face ?

I had to have my MIL watch the baby and the baby is almost 7wks old. She has two bouvier terrier. And when I dropped him off and she didn't lock her dogs in the cage and one dog licked my baby's face. It freaked me out. Now I am so anxious and panicking thinking I should have never had my MIL watch the baby. I just don't really feel comfortable dogs around my baby. I told my husband to call her and tell her to keep the dogs away from the baby. She said yes but I am still nervous and kinda upset that she would even let dogs kiss him. It's his first time sleepover and I don't know what to do.