The Issue of going to dubai for us Canadians is made much bigger then it realy is.

First of all yes your RP should be valid not for travelling to dubai issue but for when you get back to doha.

I have been to Dubai with the family so many times after the new visa changes. this is how it is

make sure you ask about your job title in the RP that will determin if you need a visa prior or on arrival if you need then I have not done that but if you are ok to get the visa on arrival this is what i usualy do...

you choose Qatar Airways if you wish arrive Dubai before going to customs stop by any of the bank windows there they have the form to fill pay the visa charge which is ONLY 180 dirham's per person adult or kid it is the same.

proceed to the last three immigration counters from the right you can tell they have the eye print projectors stop for 5 minutes your eye scan is done visa stamped and you are in for 30 days renewable.

good luck