Anyone know how to handle grief?

First, you are expressing your loss and sharing it, so others can express sympathy. This is an important first step. Your loss is real and valid and needs expression. So allow yourself to go through that process.
Once that has settled a little, its about filling your mind with other things. Not to forget. You wont. But to paper over the cracks and fill the holes with other things. The obvious is to get another puppy. But at this point that would probably be a mistake. However, find something to occupy your mind, so you dont dwell.