This is the 18219th most frequent Russian word.
четвероногих
"четвероногих" means "quadrupeds" or "four-legged creatures" in English.
Here, 'четвероногих' is an adjective referring to animals with four legs, used in the plural form and genitive case to describe the animals generally.
В зоопарке я увидел множество четвероногих животных.
In the zoo, I saw many four-legged animals.
The term 'четвероногих' describes 'friends' as four-legged in this context, emphasizing the idea of pets.
Четвероногих друзей мы часто называем питомцами.
We often call four-legged friends pets.
'Четвероногих' acts as a substantive adjective, referring to four-legged creatures, typically pets or animals cared for by humans.