Remove your hat and sunglasses. Hand them the passports, answer honest, direct and don't hesitate. When food comes up DW answers. Never had a issue, but there are random searches.
Some incidents: US Border agent took 6 tomatoes while I ate one. Had us cut the tops off of green onions. Petted the cat and never asked a question about her.
Canadian customs at Skagway stood in the door so she could see us for the questions.
No guns, firewood and limited alcohol and tobacco. Everything else may change daily.
Also if fruit etc has the little stickers it will likely be OK if it's from Canada or US. Store wrapped meat should be OK, opened no.