Just drove through Canada twice with RV in last week... Crossing in Port Huron/Sarnia and Niagara Falls on my way to/from an event in NY...
Each time was asked about pets - so certainly have your papers for them (mine was home for this trip...)
I was just 'passing through' - and I have Nexus (pre-screened traveler)- so was just 4 or 5 questions from Canadian customs... US side boarded the RV each time to look around.
US asked about any fruits... Canada asked about guns...
I had alcohol (wine, beer, liquor) but wasn't going to be consumed or left in Canada... (Canada asked...)
I had limited food on board (shopped in NY after passing through)
Here is a link on what food you can bring (some restrictions on original packaging - labeling - country of origin available):
What Can I Bring Into Canada in Terms Of Food, Plant, Animal and Related Products? - Food - Canadian Food Inspection Agency
Don't know if you will be staying in Canada - or for how long - just be aware of what you can bring back with you and limits on quantity based on time in Canada - especially if you are shopping duty free...