Snuffles

Snuffles, (who changed his name to Snowball and back again) was Morty's pet dog featured in the episode Lawnmower Dog. Snuffles is a small, fluffy white-haired dog that experiences some trouble with being potty-trained until Rick develops an IQ-enhancing helmet for him at the request of Jerry.
Snuffles is a dog who is the house pet of the Smith family. He is first mentioned in the Pilot episode, when Beth tells Morty not to kiss the living room pillow, because the dog sleeps there. He first appears in the episode Lawnmower Dog, where Jerry gets mad at him for peeing on the carpet and then scolds him for it. Rick invents a helmet that would make him intelligent enough to understand what they were telling him to do. Eventually, he becomes smart enough to figure out a lot more things about how the humans have been treating him and modifies his helmet to let him communicate with them. He keeps building and learning more, until eventually, he and many other dogs take over and treat the Smith family as their pets, chaining Jerry, Beth, and Summer up in the backyard. He also reveals that he doesn't like the name "Snuffles" and now plans to go by "Snowball". However, when Morty returns from an adventure with Rick, Snowball decides he cannot hurt the only human who actually loved him, and decides instead to leave Earth to found a planet of intelligent dogs in another dimension. After this, Snuffles would never be seen again except for his picture on the kitchen wall in a few subsequent episodes. A flashback to the episode "Lawnmower Dog" was seen in the episode "Close Rick-Counters of the Rick Kind", in a montage of all of Rick's memories. Another time when he was still in the house is also seen in the episode "Total Rickall", in a montage of all of Rick's memories. Snuffles is seen sitting at the table while Rick "plays cards" with him. Snuffles is a little white dog with black, beady eyes and a little black nose. Snowball also has a blue collar with a circular silver tag on it. It is unknown what breed of dog he is, but it's possible that he is either a Maltese, West Highland Terrier, Bichon Frise, or Shih Tzu.

Rick and Morty Wiki