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Cosmo is the pet dog in Fuller House.  


Biography

Season 1

Our Very First Show, Again

Cosmo is born in the Tanner's backyard by D.J. Tanner-Fuller.

The Not-So-Great Escape

Max picks Cosmo out of the litter of puppies, and introduces him to the family as Cosmo T.D. Fuller.

Mad Max

Max practices for his school recital in front of Cosmo who is wearing a pair of Max's underpants.

The Legend of El Explosivo

Bobby Popko attaches Jackson's phone to Cosmo's collar so Jackson can sneak out of the house.

Ramona's Not-So-Epic Party

Max is toilet training Cosmo, getting him to go outside or use a potty. When the power goes out Max sits with Cosmo in the dark in the living room thinking it could be the zombie apocalypse. After Ramona's party Max and Cosmo see Kimmy and Fernando kiss from Cosmo's dog house.

Secrets, Lies, & Firetrucks

Cosmo chews up the couch. When Max tries to get Cosmo to do tricks for his friends he just lies down.

War of the Roses

After 1,000 roses show up, Cosmo takes off with the card that has the senders name on it, and no one notices. Cosmo has been hoarding items under Max's bed.

A Giant Leap

Max tries to teach Cosmo and Tommy tricks by feeding them both dog food.

Save the Dates

Max hides out in the dog house with Cosmo.

Love is in the Air

Cosmo attends the double wedding ceremony, where Jesse and Becky renew their vows and Kimmy and Fernando almost get remarried.

Season 2

Welcome Back - Max shows Stephanie and Kimmy that he taught Cosmo how to roll over during the summer.

Mom Interference - After Max brings Cosmo back inside from doing his business in the yard, Fernando gives a piece of his bacon wrapped bacon flavoured bacon on a bed on bacon appetisers to Cosmo to eat. Max gets Cosmo to lick his face then Max wipes his hand down his cheek and smells the bacon flavour.

Ramona's Not-So-Epic First Kiss - Max lets Cosmo know that when he kisses him it means that he loves him. While Max is in his room tickling Tommy and Cosmo on his bed there is a knock at the window, it's Ramona wanting to hide from her parents.

Curse of Tanner Manor - It's Halloween and Cosmo is dressed in a red cape and horns for Max's spooky party.

Doggy Daddy - After Max gets chicken for his "One Kid Can Make a Difference" project, Max throws Cosmo a corn cob to fetch and he swallows it whole. Because dogs can't digest food that large, D.J., Max, Jackson and Matt take him to the Pet Clinic. Matt gets a x-ray of Cosmo to see exactly where the corn cob is located. D.J. and Matt operate on Cosmo to remove the corn cob.

After the operation Max comes in he tells D.J. he doesn't deserve to be Cosmo's Doggy Daddy anymore and she should look after him. D.J. tells Max he did what he did out of love and Max gives himself a second chance. Matt lift's Max up so he can give Cosmo a kiss.

Max, D.J., Jackson and Cosmo arrive home and Max wants to celebrate Cosmo being alright by having chocolate ice cream, D.J. lets Max know chocolate is poisonous for dogs.

Fuller Thanksgiving - It's Thanksgiving and it's going to be a very full house. While D.J. and Matt prepare Thanksgiving dinner, Danny, Jesse, Joey, Stephanie, Becky, Kimmy, Jackson, Ramona, Max, Tommy, Fernando, Jimmy, Nicky, Alex, Ginger, Phyllis, Jerry, Joan, Lewis and Cosmo are out playing football. By the time everyone arrives home they're 90 minutes late for the family photo. D.J. tries to take the family photo in the living room but no one will stay still.

Girl Talk - Max takes Cosmo outside to find that all his crops have grown back overnight.

A Tangled Web - Jackson lets Cosmo know that his girlfriend Lola is bringing her new dog Spot over to spend the night, so play nice be careful where to sniff.

After finding out Jimmy's music video for Stephanie's song isn't doing well, Kimmy gets the idea to pander to the lowest common denominator and use Tommy and Cosmo in the video instead.

Glazed and Confused - D.J. watches as Matt comforts Jackson and Max while they're sick and brings Tommy and Cosmo into the bed with them.

New Kids in the House - It's D.J.'s 39th birthday and New Kids on the Block (NKOTB) are at the house. NKOTB recognise Tommy and Cosmo from the music video Jimmy created and get Stephanie to take a photo.

DJ and Kimmy's High School Reunion - Jackson lies on his bed with Cosmo.

Nutcrackers - It's December 23rd and Kimmy arrives home early with D.J. as Jimmy and Stephanie are trying to take a surprise family Christmas photo for her of Jackson, Max, Tommy, and Cosmo with Fernando dressed as Santa. SteveCJ and Rose arrive with an after-hour sick pet situation. Rose's pet bunny rabbit Jack won't eat so D.J. decides to keep an eye on him overnight. Cosmo has an instant attraction to Jack.

Christmas Day. Cosmo brings Jack a carrot not knowing that Jack like Cosmo is also a male.

Happy New Year, Baby - It's New Years Eve and Danny, Jesse and Joey take Cosmo for a walk. After a hideous looking Argentinean dress Fernando had sent arrived, Kimmy hid the dress in the dog house. While setting up for the party Fernando spots Cosmo dragging the dress across the floor.

Season 3a

Best Summer Ever - It's the first day of summer and Tommy appears in Max's musical dream about having the 'Best Summer Ever' with Cosmo. 

Break a Leg - Cosmo lays in the sun on a fold-out chair wearing shades and shorts at Max's pool party.

Declarations of Independence - It's the 4th of July and Cosmo wins "Danny Tanner's World's cleanest pie eating contest", just like his great grandfather Comet did back in 1991. Danny gives Cosmo the Golden Napkin trophy.

My Little Hickey - Mankowski believes he can understand dogs and that Cosmo has told him that his real name is Derrick. Cosmo respond to Derrick when he is called.

Uncle Jesse's Adventures in Babysitting - Cosmo comes inside covered in mud, and follows Jackson, Max and Jesse as they chase each other around the kitchen.

M-m-m-My Ramona - Max is having an existential crisis after Tommy destroys his beloved Uni so he sits with his emotional support animal Cosmo.

Say Yes to the Dress - Jackson announces for everyone to do less lovey-dovey family stuff and specifically tells Tommy and Cosmo not do do anything ridiculously cute. Tommy kisses Cosmo then Cosmo licks Tommy and Tommy puts his arm around Cosmo.

Maybe Baby - When Max let's Cosmo outside, Max hands Cosmo a bag to collect his own business in.

Wedding or Not Here we Come - Jimmy will be looking after Cosmo while D.J., Stephanie, Kimmy, Fernando, Jackson, Ramona, and Max are in Tokyo for five days.

Season 3b

Troller Coaster - Tommy plays doctor with Cosmo.

A Tommy Tale - Stephanie reads to Cosmo thinking it's Max after Max puts Cosmo in his bed wearing a wig and his pyjamas.

Surrogate City - Just after Rocki announces that she believes the Fuller's live in an artificial world of sugar-coated sweetness, Tommy and Cosmo walk through the kitchen in matching sunglasses and bandanna's around their necks.

Soul Sisters - When Max acts as the ancient mariner statute head in an attempt to fool everyone, Cosmo doesn't fall for the trick and starts barking at him.

Happily Ever After - Fernando races Tommy and Cosmo around the living room.

Here Comes the Sun - Cosmo dressed in a wig attends the 80s-themed costumed 30th Dad-iversary party at the Smash Club along with Danny, Jesse, Joey, D.J., Stephanie, Becky, Kimmy, Fernando, Jackson, Ramona, Max, Tommy, Steve, Jimmy, Rose, Pamela, Rocki, Vicki and the Rippers.

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