I think it would be beneficial to see some pet-only equipment in the mud. Some of this could also be attributed to centaurs and their lack of equipment in some areas.
I would volunteer my services for the research and production if approved

Pet-only equipment???

Holy/Unholy Dog Collar of Disruption: +Dam +Hit for Pet, Easy Act 'Dispel Evil' or 'Corrupt', (Pet Neck)
Adamantium Dog Whistle: +10% Advanced Recall Quality, (Owners Neck), (!Evil)
Skeleton Gerbal Ball: +50 Moves for Pet, -15 AC, (About Pet Body)
Horrific Aura of Hairball: -10AC, Easy Act 'your pet's aura hurls a sticky hairball at X' inflicts 10-20 dam, %chance 'Poison', (Pet Body)
Furry Blanket of Gluttony: +DAM +HP, Provides Food Automatically to Pet, (Pet Body)
Vile Huberek of Chihuahua: +STR for Pet and Good AC (Pet Body) (!Good)
or a rare load of Titan's Retractable Lead: Light, +Dam +Hit +STR (Neck)