15 Month old won't stop bitting

First time dad and kinda taken aback by the vicisousness of this phase. Our 15 month old has ocationally bit whoever is holding him but the past week or so he's crawling around bitting his mother and me 100 times a day, he even bit the dog twice this morning. It really hurts and I'm scared how its going go when his cousins visit this weekend.

We been trying clear firm communication "we don't bit" "bitting hurts" "we only bit food" but communication is a bit hit or miss at this point in general. Anyone have any suggestions or been here before?