Dog snapped at me while holding baby

I was cleaning up my 9 month old after dinner time and my dog had gotten the baby’s spoon off the high chair tray. I nudged him and told him no and he snapped at me. I grabbed him by the collar to get him outside and he became more aggressive. I had to hold him there until my husband got inside the house to get him outside.

He’s snapped like this one other time about a year ago but it wasn’t over food that time. One of our other dogs has had to have surgery twice over getting in a fight with him.

I feel very torn on what to do even though I feel like I know the answer. He’s very sweet most of the time but then there’s the 1% where he snaps. I just feel very worried now that we’ve added a baby in the picture.