在某个3丁目，冈本家的猫猫・圆圆，和他个性丰富的小伙伴们一起过着和平的每一天。某天，午睡醒来的圆圆，见到了一只路过的白猫。十分在意的他没有多想便追了上去。原本来找圆圆的狗狗波奇，也一同跟着追踪白猫。

波奇和3丁目的小伙伴，小黑和小黄说了和圆圆出去时所遇见的狗狗的事情。面对着一劲形容着对方恐怖的波奇，小黑和小黄对那只狗狗产生了很大的兴趣，决定去打个招呼看看。

某天，贝贝和小虎到圆圆家玩，看见圆圆在纸箱里呼呼大睡。因为小虎突然跳进纸箱的冲击，纸箱坏掉了。难过的圆圆决定和贝贝一起去寻找传说中的威夷夏。

刚刚搬到3丁目的布鲁，为了不要被其他的猫猫和狗狗小看，想努力练习问候，但却被仓持君给带出门了。来到3丁目猫犬猫绿洲的吃茶Tulip，布鲁碰见了命运的相逢。

某天，小黑和小黄一边躺在草地上，一边感叹着3丁目的和平。同时，在一旁追逐蝴蝶的贝贝，脸颊上的OK绷慢慢地掀起。

圆圆和波奇一同追的被风吹起的叶子玩耍。追叶子追得太过入迷，不知何时两只竟然跑到了电车里面，并在软绵绵又暖呼呼的座位上睡着了。

小虎和点点争论谁才是3丁目最强，于是两只开始了关乎胜败的对决。最终，胜利的是哪一边呢……！？

某天，小黑和小黄在公园看见了沮丧的波奇。两只询问了波奇沮丧的原因，竟然是因为3丁目最强决定战时毫无表现的缘故。对着这样的波奇，小黄开始讲述了传说中的不良，阿狼的故事。

某个早晨手忙脚乱准备去上学的小武，看着在走廊上悠闲的圆圆说了，什么都不用做只需要睡觉真好。因为这样一句话而闹别扭的圆圆，像平常一样去找波奇它们玩耍，却发现大家都有各自的工作。

家具店野田所饲养的小黄，在中意的店门口椅子上默默守护着3丁目的伙伴们。某天，散步中的布鲁出现在他面前。

某天，“有小偷——”的呼喊声，响彻了应该要很和平的3丁目。

圆圆、波奇、小虎听见了小武他们所\讨论，关于传说中有妖猫出现的房子的话题。3只马上就为了要确定谣言真伪，而进入了那栋房子。此时，从来没听过的叫声和古怪的身影出现在他们面前。

某一天，为了松之汤每个月举办一次，饲主能和宠物一起享受澡堂的“汪喵洗澡日”广告牌娘点点正意气风发地准备着。虽然圆圆不喜欢洗澡，但受到喜爱洗澡的波奇与小虎的鼓励，也前往了松之汤。

在3丁目派出所为大家服务的狗狗警察，小黑。某天，他接到了对于在吃茶Tulip引起事件的嫌疑犯，妙妙，的调查。在一触即发的紧张空气中，妙妙终于开了口。

“3丁目Crazy Cats”是连哭泣的小猫听到都会安静的3丁目一大势力，他们用压倒性的力量保持著町内的平衡。某天，在3丁目Crazy Cats面前出现了负伤的布鲁。询问了布鲁究竟碰到何事，他竟然说出了以哈士奇若为首的“7丁目Young Kings”，正盯上了3丁目……？

晚间野餐某天，圆圆他们带著自己平常吃的饭饭，来到公园集合。一边介绍著自己带来的饭饭，一边开始了野餐之夜。

Koma and Tora argue about who the strongest person on Third Street is, so they hold a tournament!

Because of the tournament, a certain someone feels like he was the weakest guy on Third Street.

What does Tama do all day while the other cats and dogs are working?

Gon has a one One Dog Show where he can never get bored.

Kuro patrols Third Street to protect the peace.

Tora, Pochi, and Tama venture inside to an abandoned house.

It's Pet Day at Matsu Bath, so all the cats and dogs enjoy a bath together.

Momo has gotten in trouble with the Dog Police.

The Seventh Street Young Kings have their sights set on taking over Third Street. Can the Third Street Crazy Cats defend their territory?

The Third Street cats and dogs enjoy a night picnic together.

Tama gets kidnapped and the cats and dogs of Third Street are on hot pursuit!

Momo's button flies off as she catches it in the air. What could be causing this?

The cats and dogs of Third Street hear about a new cat café in the next town over.

The Summer Festival is happening on Third Street, but there's something about the festival music that reminds Nora of his past.

An AIBO has come to Third Street looking for Tama.

Nora finds a stray kitten and can't help but take him under his wing for a little while.

Tama and Tora try not to fall asleep so they can try to get tasty treats.

Beh and Bull go on an adventure and they become best friends.

Tama has discovered his true identity! What could it be?

The cats gather and have a meeting regarding the strangeness of humans.

Tama and the gang find out what Takeshi's and Kuramochi's treasures are.