Well going with a simplified system of the breeds.
Sighthounds- Including the Greyhound, Saluki, Wolfhound, etc but not the Italian Greyhound or Whippet.
Medium Sized Animal
HD: d8 + 2
Initiative: +3
Speed: 60'
AC:15 +2 Natural +3 Dexterity
Attacks: Bite +3
Damage: Bite d6+2
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort +4 Ref +5 Will +1
Abilities: Strength: 15 Dexterity: 17 Constitution: 15 Intelligence: 2 Wisdom: 12 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5, Wilderness Lore +1
Feats: Run
Scenthounds- Probably closest to a foxhound
Small Sized Animal
HD: d8 +2
Initiative: +2
Speed: 40'
AC:15 Natural +2 Dexterity +2 Size +1
Attacks: Bite +2
Damage: Bite d4+1
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort +4 Reflexes +4 Will +2
Abilities: Strength: 13 Dexterity: 15 Constitution: 15 Intelligence: 2 Wisdom: 14 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5, Wilderness Lore +3
Feats:
Mastiffs- Bullmastiff etc
Medium Sized Animal
HD: 2d8 +4
Initiative: +1
Speed: 40'
AC: 16 Natural +4 Dexterity +2
Attacks: Bite +3
Damage: Bite d6+3
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort + 4 Ref +5 Will +1
Abilities: Strength: 17 Dexterity: 15 Constitution: 15 Intelligence: 2 Wisdom: 12 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5, Wilderness Lore +1
Feats: -
Toys- Pets for nobles
Tiny Sized Animal
HD: d8
Initiative: +3
Speed: 30'
AC:17 Natural +1 Dexterity +4 Size +2
Attacks: Bite +2
Damage: Bite d3
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort +2 Ref +5 Will +1
Abilities: Strength: 8 Dexterity: 17 Constitution: 10 Intelligence: 2 Wisdom: 12 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5
Feats: -
Shepherd- Belgian Malinois, etc
Medium Sized Animal
HD: d8 +3
Initiative: +2
Speed: 40'
AC: 15 Natural +3 Dexterity +2
Attacks: Bite +2
Damage: Bite d6+2
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort +5 Ref +5 Will +2
Abilities: Strength: 15 Dexterity: 15 Constitution: 17 Intelligence: 2 Wisdom: 14 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5
Feats: Endurance
Retrievers- Goldies, Newfoundland, etc
Medium Sized Animal
HD: 2d8 +4
Initiative: +3
Speed: 40'
AC:16 +2 dexterity +4 natural
Attacks: Bite +2
Damage: Bite d6+2
Face/Reach: 5' x 5'/ 5'
Special Qualities: Scent
Saves: Fort +5 Ref +5 Will +1
Abilities: Strength: 15 Dexterity: 15 Constitution: 15 Intelligence: 2 Wisdom: 12 Cha: 6
Skills: Listen +5, Spot +5 , Swim +5,
Feats: -