When a dog of a dangerous breed is abandoned in front of Sofia, she decides to take her in, despite the colony of cats she has at home.

Hello Odie, thanks the coment!

How about:

Sofia, a young sportswoman and cat lover, watches a Bull Terrier dog being thrown out of a car.
Worried rescues the animal, despite the cat colony she has at home.

3. The title is puzzling as adoption is a choice. She can just take the abandoned dog to the pound – end of story. Is there a long-term situation?

throughout the narrative, she tries to take the animal to the kennel.

the character's dilemma in the story is to hold the dog in a house full of cats, while
look for a new home for the abandoned animal

Consider the following:
1. Be specific with the breed to orientate the reader.
2. Who is Sofia? At the least "A young woman..."
3. The title is puzzling as adoption is a choice. She can just take the abandoned dog to the pound – end of story. Is there a long-term situation?

Example:
“A cat lady must [Action/GOAL] when [Major Event] e.g., stuck with an abandoned pit bull during a pandemic lockdown”

Hope you find this constructive, keep going!