Comparing to Alyx in HL2: Episode 1, I can actually see a lot of merits to having a silent animal as a companion.
- The AI might be stupid at some points, but when you yell "No, you idiot you'll get yourself killed!" it's a bit more immersive to a dog that can't understand you than an english-speaking human.
- He's short enough he won't block your bullets.
- He can make small noises to draw your attention to something, but cannot possibly ever order you around, as Alyx did once too often in Episode One. It often felt I was pressured to keep going rather than checking out the surroundings, as I did in the original HL2. With a dog, it's obvious who the master is, so you don't ever need to feel he's pressured. You're the player and you're the spotlight.
-He's cute, but still expectably ferocious.
I actually kind of thought for a while about the possibility of some single player game that just has a brief, one-chapter segment where a dog is following you around, offering small assistance in certain puzzles, as well as combat, etc.