Continuity mistake: In the scene where Bruce and Andy are hiding from Animal Control with the dogs, the two Animal Control people step on the "Bone Sweet Bone" pillow and leave a dirty footprint. When Friday goes to get it later, it is clean.
Continuity mistake: When Bruce checks one of the dogs, Henry, into the hotel, he writes the name into the ledger in green. When Bernie later reads the book, the name is written in red.
Continuity mistake: During the scene in the hotel, when the toy train is pulling out all the bowls for the dogs on the table, the train reaches the end and it hits a bell. The bowls are now in front of each dog relatively close to the edge of the table. The scene cuts to the kids at their table, in which they all touch glasses. Now when the scene cuts back to the dogs at the table, you can see that the bowls have disappeared. This happens approximately one hour into the film.
Continuity mistake: Towards the end of the movie when the van screeches to a halt just after all the dogs run off in the wrong direction, the outside shot shows the back door of the van is closed. The next shot from the inside of the van shows the back door to be still open.
Answer: Lots of people were running with the dogs to the hotel so someone could have very easily helped Chelsea get to the hotel the easiest way to get her there would be to carry her.