You got lucky, indeed. I did now look a bit more at the Canadian government web site that mentions these “four weeks” of farm work as an example of what would be ok without a work permit.
The other requirement is that tourism must be the primary reason and that is then explained in this guidance:
Note: The farm work cannot be the main reason for entering Canada; the foreign national must have other plans for the majority of their time in Canada. Volunteering is to be secondary (incidental) to the main reason (i.e. tourism, visiting family/friends, etc.). https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/temporary-residents/foreign-workers/work-without-permit/authorization-work-without-work-permit-assessing-farm-work.html
Up to four weeks pet sitting is ok, but you also need plans to go camping for a month (or RV, or hotels etc). So take a tent with you as proof that you have such plans! (But plans can change of course, with the weather. You do not actually need to go camping.)
As it stands, the advice by THS is getting their customers in trouble, completely unnecessarily.