You're not the only one who needs protection.
You already know you can recruit companions in Fallout 4, hand them the weapons you find and even gift them some armour for protection.
That's fine for human-sized friends. But when it comes four-legged companions the options are pretty slim.
However, it turns out there is some special armour for Dogmeat, you just need to know where to look and go fetch.
Where to find armour for Dogmeat
The nearest spot to the armour is Rocky Narrows Park. If you haven't discovered that location, you want to look directly west of Corvega Assembly Plant and south of Concord. Look at the pointers on the Pip-Boy map below.
You're looking for a gorge, and within that a little dugout where you'll see three dog bowls. Feeding around this area are some nasty mutts, but they're no real threat.
Around the dog bowls you'll find three items; Chain Dog Collar, Dog Helmet and Dog Armor.
Once you have them, Command Dogmeat, Trade with him, pass the items over to his inventory, and press Triangle to equip. You now have a tough as steel Alsatian.