Jack surprises the girls with a four-legged bundle of joy, a puppy gifted to Jack by his shifty pal Larry (Richard Kline, in his very first series appearance). The three roommates love the little girl, but know that they can't keep her for long since Roper doesn't allow pets in the building. For the time being, they do their able best to keep the puppy hidden from the Ropers until they can find her a permanent home.
While not an uproarious episode, 'No Children, No Dogs' still delivers some decent laughs, especially when Jack and Janet try to look after a sleepwalking Chrissy and he continuously has slapstick misadventures. John Ritter truly was a master at this sort of comedy. There's also a key moment when Jack and Chrissy are tending to the dog in their little kitchen, and Janet overhears their conversations. Classic misunderstanding in the 'Three's Company' tradition! Of course, part of the appeal of this continued gag is the variety of shocked faces made by the person doing the overhearing.
The cast is all great, as always. One of the most priceless bits involves Roper chowing down on a meal fit for a canine, if you get my drift. He even asks Jack for the recipe, thinking it was something Jack made in cooking school. It's fun seeing Larry for the first time, a while before Kline became a true official co-star.
Overall, a good, solid episode that gets off to a fine start, with Mrs. Roper finishing a saucy book given to her by Janet.
Seven out of 10.