Certificate of Good Conduct

A letter of good conduct states that the requesting party has no criminal arrest record, So this would be the same as a crimminal record check. In Canada from RCMP, OPP, QPP....etc.

is a dominican certificate that you need?

heres how

You go to DR immigration (large building along the ocean). You apply, pay a little money and they tell you to return to pick up the certificate of good conduct. I have to do it also to get my DR drivers license even though its part of the cedula process and my cedula is only two months old. You can probably do it through a lawyer without having to go down to the office in person. Of course it will be a lot more expensive.

As zoom said, you can probably do it via a lawyer.

Guzman Ariza Law Firm in the Dominican Republic

dont you have relatives here or friends
also you can go to the rcmp and tell them that you need a background check via interpol

usually relatives will not get that for you.
to get it in person is since a long while quick and easy and hassle free.
330 pesos in change money, go to the office of the next mayor office of your home , they issue it everywhere, bring a copy of your up to date renewed cedula, wait 10 - 20 minutes and leave with your certificate. it is valid for 90 days.at least that's the actual procedure in Higuey.
in case of a lawyer doing such for a person out of the country i have no clue about the rules.
i would guess that the dominican embassy in Ottawa is your place to go to to get such papers from your homecountry, at least that's what embassies and consulars should be there for.
their contacts in Ottawa are
phone: 513-569-9898
fax: 513-569-8673
e-mail: info@drembassy.org

in case you are not a dominican citizen or a foreigner with a still up to date renewed cedula, forget about it.
good luck
Mike