Borax might not be sold in Canada either but if you do use it you just have to remove the pets first- let it sit- then sweep it up.

Here is what I found googling borax for fleas......

Boric acid, which is in Borax , kills fleas and the larvae by dehydrating them--drying them out is how I understand it. You can go to a hardware and buy boric acid or pick up a box of Borax at the grocery store. If your area doesn't have it, ask around for a laundry aid that contains boric acid. Sprinkle it on the dry carpet, allow it to sit overnight if possible, then vacuum in the morning. Vacuum twice if you have to, then throw away the bag. If you aren't sure and your carpet is newer --I'd test a spot first to make sure it doesn't fade. You will have to repeat this every two weeks--to make sure you get them all. Keep up the steady vacuuming. It also might be easier to put the borax in an empty oatmeal or cornmeal container-then poke holes in the lid-then take the top to make sure it's secure, and sprinkle on that way. An extra option is to add 20-25 drops of an essential oil to the borax first---working it in with your hands (wear rubber gloves). Let it sit a couple of hours, then put in the container and sprinkle. You can use cedar, citronella, pennyroyal, lemongrass, rosemary, eucalyptus, and lavender. This is optional though...