runt

US /rʌnt/
UK /rʌnt/
"runt" picture
1.

the smallest or weakest of a litter, especially of pigs or dogs

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The little puppy was the runt of the litter, but he was the most playful.
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Even though he was the runt, he grew up to be a strong and healthy dog.
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dwarfmidgetshrimpundersized animal
2.

a person who is small and weak

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He was always picked on because he was the runt of the class.
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Despite being a small runt, she had a huge personality.
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shortysquirtpeeweeshrimpdwarf