A dog is the most friendliest pet
guinea pigs
No, "most friendly" is not grammatically correct. The correct form would be "friendliest" when comparing three or more things.
it is an animal
Friendlier and friendliest, respectively. More and most friendly are also correct, sometimes.
The noun form is friendliness (for friendly, friendlier, or friendliest).
She was the friendliest person I had ever met, always greeting everyone with a warm smile. The jolliest man at the party danced and laughed with infectious energy, spreading joy to all around him.
It really depends on the bird, and on your opinion.
the superlative of friendly is friendliest
ABSOLUTELY! It is one of the most peaceful and friendliest countries in the world
your ugly>3 Uh.. kay. Friendliest (Or "most friendly")
Friendlier or more friendly are the comparatives, and friendliest or most friendly are the superlatives.
The African country that is the friendliest towards Americans is Liberia.
If by "friendliest", you mean most comfortable, the Boeing 747 in its Upper Deck Lounge configuration has the widest aisles, most leg room, and most comfortable seating. First class in a 747 is the equal or better of any existing passenger aircraft.