36 cards where the card types include “dog” and the colors ≥ R

Ainok Tracker (Khans of Tarkir #96)
Akoum Hellhound (Zendikar Rising #133)
Arcbound Tracker (Modern Horizons 2 #112)
Ashmouth Hound (Jumpstart #290)
Blazing Hellhound (Double Masters 2022 #183)
Blood Hound (Mercadian Masques #176)
Bolt Hound (Core Set 2021 #131)
Carnival Barker (Unfinity #102)
Chandra's Magmutt (Core Set 2021 #137)
Dogmeat, Ever Loyal (Fallout #2)
Edgewall Pack (Wilds of Eldraine #126)
Fiery Hellhound (Magic Origins #284)
Goldhound (Streets of New Capenna #108)
Hellfire Mongrel (Duel Decks: Ajani vs. Nicol Bolas #48)
Hound of Griselbrand (Avacyn Restored #141)
Igneous Cur (Core Set 2021 #153)
Karplusan Hound (Dominaria #277)
Komainu Battle Armor (Neon Dynasty Commander #21)
Kroxa and Kunoros (March of the Machine #245)
Lava Hounds (Eighth Edition #198)
Lightning Hounds (Mercadian Masques #201)
Mad Dog (Odyssey #202)
Mogis's Warhound (Journey into Nyx #104)
Monstrous Hound (Exodus #89)
Pack Mastiff (Core Set 2020 #152)
Pako, Arcane Retriever (Commander 2020 #13)
Pyre Hound (Masters 25 #145)
Rakdos Ragemutt (Return to Ravnica #185)
Rin and Seri, Inseparable (Core Set 2021 #278)
Scrapyard Mongrel (Magic 2015 #160)
Tesak, Judith's Hellhound (Murders at Karlov Manor Commander #36)
Two-Headed Cerberus (Theros #146)
Underworld Cerberus (Theros #208)
Underworld Rage-Hound (Theros Beyond Death #163)
Wildfire Cerberus (Journey into Nyx #116)
Zodiac Dog (Portal Three Kingdoms #130)

This search is finished. Now the real work can begin.