So as far as I can find the limit is 50 pets to house no matter the house with no way to increase it. I think we need a house made with a high pet limit (maybe low items to even it out) because for those that collect pets for various reasons it would be nice to have a house that would hold more then 50 pet/mounts. Maybe make it a house in the higher worlds. The other possibility is to make an elixir that add +25 pet limit to a house.