You have a valid point here. Some agents do not fill in all the info on the MLS,
They should at least have the HOA info listed, since all they have to do is ask the seller what the HOA fee is.
Pet policies, I have to say is something I NEVER see on the MLS. I always call the HOA managment company and ask for myself.
The best thing for you to do is have your agent investigate these things for you prior to writting up an offer.
Best Of Luck To You!
Kawain Payne, Realtor