No, an animagi can only attain one animal form, and if they could attain more than one, than Pettigrew would probably have tried to change into a different animal after Sirius was after him so that he wouldn't know it was Pettigrew, since Pettigrew is recognizable as a rat without one of its front fingers.
You cannot choose your Animagus animal
But realistically, an Animagus is closely linked to your personality. For example, the brave and rebellious James Potter is famously a stag, whereas the conniving journalist Rita Skeeter is a beetle.
In Harry Potter, can you become an Animagus if you're also a Metamorphmagus? A metamorphmagus has an innate skill. You have to learn how to become an animagus. Nothing in the books suggests you cannot be both, but assuming you are a metamorphmagus, you still need training to become an animagus.
As a pack animal, or as a “lone wolf,” the wolf is a perfect fit for Harry's Animagus form.
Because there was no need for him to become one. Besides he had lot of other important stuff going on in school unlike his father and his friends who were determined to help Lupin.
“A creature I wouldn't want to kiss . . . a spider!” Harry figures out the riddle, and realizes that a spider is about to attack. But what he doesn't realize is what I now believe: that the spider in the maze is Professor Snape, in his Animagus form. It is Spider/Snape who bears down on Cedric and Harry.
He didn't mention that Sirius was an Animagus to Dumbledore because he didn't want to admit to breaking his trust while at school. All in all, Remus did the most to help Harry and the wizarding world.
Draco's boggart would likely be in the form of the Grim Reaper with young Malfoy's own face under its hood. Surprisingly, Lord Voldemort was not Draco's greatest fear.
Peter Pettigrew's Animagus form was a rat. Colloquially, a "rat" is a snitch or informant. Webster's also lists the following possible definition: "a contemptible person: such as... one who betrays or deserts friends or associates."
Sirius Black and James Potter attended Hogwarts together, and Sirius is Harry's godfather. Sirius is an Animagus, which means he can transform himself into a black, shaggy dog named Padfoot at will.
Animagus. Lily's animagus form is a Doe, coupling with her husband, James Potter who is a Stag. Severus Snape's animagus is also a Doe.
Madam Professor Minerva McGonagall (born 4 October 1935) was a witch and Animagus who attended Hogwarts School of Witchcraft and Wizardry from 1947 to 1954 and was sorted into Gryffindor.
Voldemort was never given a reason to become an Animagus. We know his greatest desire is to be immortal, and being an Animagus would not help this. On the other hand, being an Animagus would not give him any special power in clearing his way to immortality. Killing curse is usually enough for him.
They are James Potter, Sirius, Wormtail, Skeeter, McGonagall, Talbott Winger, and an unnamed witch who can turn into a cat. The fact that there are so few Animagi just causes us fans to want to know more about them. After all, they are some of the most unique characters in all of Harry Potter.
A teacher who taught the skill did not need to be an Animagus themselves, as shown when Professor Dumbledore, who was not an Animagus, taught Minerva McGonagall how to successfully become one.
The punishment for being an unregistered Animagus was time in Azkaban so, when clever-clogs Hermione discovered Rita's secret, the threat of exposure was enough leverage to make her stop writing those poisonous articles.
Known Animagi
Falco Aesalon — Falcon; the first recorded Animagus; the registration system was not in existence in his time.
Sirius's early life proved unhappy; he had come to hate most of his relatives, in particular his mother. He rejected his family's pure-blood elitism and reverence for the Dark Arts. At Hogwarts, rather than be sorted into Slytherin like the rest of his family, Sirius was placed in Gryffindor.
Talbott Winger was a wizard who attended Hogwarts School of Witchcraft and Wizardry in 1984 and was Sorted into Ravenclaw house. He was also an Animagus and took the form of an Eagle.
Godric Gryffindor never died. He is an animagus that took the form of a phoenix and can no longer transform back to his human form due to it being so old.
Following both ordeals, Ginny grew into a confident young woman. Her and her friends followed in the footsteps of a previous generation, completely unbeknownst to them, and became Animagi at the age of fourteen, to support their best friend, Maisie Cattermole. Ginny took the form of a grey mare.
Narcissa also had many abilities. She was an Animagus, a Magpie, the same as her Patronus, Metamorphmagus, Parselmouth, Legilimens, Occlumens, and could do nonverbal and hand magic, as well as being able to fly unaided.
James is the youngest marauder (even though Peter acts like it), and his favorite thing to do is tease the other boys about getting old first. He calls them grandpas and jokes about how they're all going to kick the bucket before he does.
Sirius Black had a lot of love in his life. Mainly for his best friends but still. One of the greatest loves came not from his connection to James Potter but rather with his relationship to Remus Lupin.
Did Dumbledore know the Marauders were unregistered animagi? No, he didn't until very much later. James, Sirius and Peter turned themselves into Animagi without the knowledge of the wise old headmaster.