Attack bears from RA3? They are nice, but my personal favorite pack of dogs in RA1. Those rabies affected dogs would leap 12 feet away to always attack the enemy's throat, then they would proceed to jump another 12 feet to hit another guy the very same second! If three dogs could survive to leap toward a pack of 20 enemies, the dogs would come out on top as they jump from enemy to enemy! I was very saddened that my super dogs were nerfed in the Red Alerts thereafter.
Also welcome fellow C&C fan.
I loved the attack dogs in RA1, too, but felt awful when they were inevitably crushed under uncaring tank treads. At least when the attack bears take on a tank, it plays out (at least in my mind) as this crazy epic battle: THAT FUCKIN' BEAR AIN'T PUTTING UP WITH NO TANK SHIT IN THIS HOUSE.
Either way, I cut my teeth on RTSes with the C&C series. Whether it was killing dinosaurs in vanilla C&C or killing giant ants in RA, I was constantly having a blast. Haven't really tried C&C 4. Gave it a wide berth after all the awful reviews/janky DRM built into it. On paper, it still sounded like an alright idea, I suppose.
At any rate, I still find myself looking to C&C even as I play other RTSes these days.