Sneaking animals in... something people seem to be oddly insistent upon doing. For various reasons.
Those who work in the luxury sector in London have more than a few anecdotes about fearsomely rich Middle Easterners who book up the five-star hotels during August, spend like mad, order up room service - then the poor room-service waiter brings in their order, and finds a goat being killed in the middle of the suite. Rather more extreme than a simple overnight with a pet, that. It's happened at the Four Seasons London, amongst other places. And here's the thing - no-one ever sees the goats going up to the rooms. You'd think something like that couldn't be got across a lobby without some kerfuffle. But somehow they manage it.
Anyway, yes. Thoroughly inadvisable to sneak a pet in. A very quick way to get on the blacklist, I'm afraid.