I have yet to see someone run around as an adult but be the size of a pup though they don't really bother me. I mean, if they want to be that size, then I don't see no harm in that. I think the only way it'll erk me is if they start insulting/power-playing/annoying me in some shape or form.
I can make a realistic sized wolf, male, even, go to a Warrior Clan's camp, and I'll bet you that there'll be over 5 cats bigger than me, and some with actual whole lion manes. I get peeved by the people who oversize their character so they're a "strong, brave, really big and powerful cat". I've got news for you, those people: CATS AREN'T BIGGER THAN FULL GROWN WOLVES. I've only seen 2 Tiny- or Little- prefix cats during my entire time playing FH. It's really annoying. They think that since they're bigger than you now, they're more powerful and can kill you. ._. Really? Your cats are lion-sized, I'm realistic sized... How exactly does THAT work?! "My dad was Tigerstar/Scourge/Brambleclaw/Hawkfrost!" Or maybe, "I'm related to Deathstar!" Just because you're supposedly related to a certain cat doesn't give you the right to be HUUUUGE. Besides, none of the cats listed in the first one ever had more children then what they already had. It's impossible to be any of their kids, since most are DEAD. I REPEAT, IF YOU ARE RELATIVE TO DEATHSTAR, IT DOES NOT MAKE YOU INSTANTLY HUGE AND DEADLY. I feel like I'm getting really off-topic, but sorry, the cats are too big, and wolves in SP are really small to me.