You really need to discover what the intent of the by-law is and if it is really necessary. The model by-laws and the strata law dealing with the removal of dogs that have been approved but turn out to be a nuisance should be enough. But if the strata committee feels they want to deter new dogs from being brought into the building by imposing specific restrictions that is another matter and it should be explained before the AGM in papers issued with the agenda.