Fridge Horror: It's made very obvious that the dogs at Rowlf's work are dropped off by their owners on vacation. However Rowlf takes them with him to New York - there's going to be some unhappy owners....
Though one of the owners was a jerk anyway. Still, he clearly loved his Snookums.
This is probably the very reason Rowlf took them to New York with him. He didn't want them left unattended.
Also consider how unhappy most of them were, pitifully howling that they want to go home. Rowlf did them a huge favor.