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 jerkass 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.