I used to take Geno to daycare when I had school at night last Spring. He loved it! They separated the dogs by size but sometimes the owner would bring in this big sheepdog and she would just lay down and let all the little dogs jump and run all over her lol She wasn't a very active dog so she pretty much just laid there so I didn't really worry too much. Geno met his girlfriend at daycare - little 10lb yorkie Bella
Also check meetups in your area for small breed get togethers. Our daycare sometimes hosts them and we've always had a blast
Best thing about daycare though, when I bring G home, he is out for the rest of the night! lol