Hound archon

Hound archon: These hound-headed angels are the resolute foot soldiers of the celestial army. They are often sent to defend the innocent and protect the weak.

Statistics
A hound archon has a creature weapon that inflicts 1d8+2 slashing damage, but this creature cannot be disarmed.

Special abilities
A hound archon has damage reduction 10/+1, spell resistance 16, and a +4 bonus to saving throws versus poison. In addition, this creature has 100% immunity to electrical damage as well as immunity to paralysis.

A hound archon can cast aid as a spell-like ability (meaning it is not subject to interruption or counterspelling) six times per day with a caster level of 6. Furthermore, a hound archon can use an aura of menace once per day.