Dog pissed on speaker

Covering odor does no good, you need a solution that has microscopic bugs to eat the source of the odor. Call a large commercial janitorial supply company that sells to municipalities and hotels. If you talk to somebody knowledgeable they will know about microscopic bugs.They will have a liquid and maybe a special aerosol can that can be atomized so it won’t come out wet.

As long as the dog stays you have only  Two options:

Train the dog to stay out of the room. Always.-Invisible fence.

Cover the speakers. 

Meantime buy a new driver and consider the fence option.

Yes he will do it again. In the same spot too!

The Urine-Off enzymatically changes the source of the order, it does not cover it up. Covering it up doesn’t work! This does. Something I deal with a lot (not on audio gear but in homes). You could replace everything but I would try the hand spray version of this first. You can also spray it on a cloth and wipe down the areas you want to control moisture with a few applications.

Try mild blow of Hair dyer for long hours, Try talcum, Chickpea flour, activated charcoal even Soda ash But don't forget brush it off/ careful vacuum or air blowing. Don't use fine powder but rough powder, if not readily available sieve it your self. IPA/glass cleaner( may harm impregnated resin OR coat) smell Masking agents like vinegar/ scents. But try everything mentioned on near similar paper doped with dogs urine if result is satisfactory go ahead with care in horizontal position for many hours until you are happy with result.