This is where you will find all the companion shops(they are in red circles). 
Inchworm $600
Treeton Pet Shop
Bonus: +2
Ladybug $650
Appleton Pet Shop
Bonus: +2
Spider $650
Hotton Pet Shop
Bonus: +2
Morpho Butterfly $660
Wington Pet Shop
Bonus: +3
Monarch Butterfly $720
Shellton Pet Shop
Bonus: +3
Fish $780
Earton Pet Shop
Bonus: +3
Pet Rock $780
Appleton Pet Shop
Bonus: +3
Mouse $1,200
Whiskerton Pet Shop
Bonus: +4
Starfish $1,040
Appleton Pet Shop
Bonus: +4
Gerbil $3,000
Treeton Pet Shop
Bonus: +6
Rat $3,250
Found on Prison Isle, but can be bought from pet shops
Bonus: +6
Gecko $3,900
Hotton Pet Shop
Bonus: +8
Guinea Pig $3,900
Appleton Pet Shop
Bonus: +8
Chicken $4,400
Wington Pet Shop
Bonus: +10
Turtle $4,800
Shellton Pet Shop
Bonus: +10
Kiwi $5,500
Wington Pet Shop
Bonus: +12
Pigeon $5,500
Wington Pet Shop
Bonus: +12
Squirrel $6,000
Treeton Pet Shop
Bonus: +12
Peacock $6,601
Wington Pet Shop
Bonus: +15
Turkey $6,601
Wington Pet Shop
Bonus: +15
Parrot $7,701
Wington Pet Shop
Bonus: +17
Owl $8,800
Wington Pet Shop
Bonus: +19
Penguin $9,900
Wington Pet Shop
Bonus: +22
Hedgehog $10,400
Hotton Pet Shop
Bonus: +19
Bunny $12,000
Shellton Pet Shop
Bonus: +25
Ferret $12,000
Whiskerton Pet Shop
Bonus: +25
Chocolate Bunny $0 (Easter gift from the Easter Bunny)
Easter Bunny, Hare Isle
Bonus: +50
Piglet $37,200
Treeton Pet Shop
Bonus: +70
Racoon $43,200
Treeton Pet Shop
Bonus: +80
Fennec Fox $48,100
Earton Pet Shop
Bonus: +85
Monkey $49,400
Hotton Pet Shop
Bonus: +90
Lamb $46,9800
Shellton Pet Shop
Bonus: +95
Calico Cat $51,600
Whiskerton Pet Shop
Bonus: +100
Persian Cat $51,600
Whiskerton Pet Shop
Bonus: +100
Ragdoll Kitten $51,600
Shellton Pet Shop
Bonus: +100
Orange Tabby Kitten $51,600
Treeton Pet Shop
Bonus: +100#
Tuxedo Kitten $55,900
Earton Pet Shop
Bonus: +100
Black Cat $55,900
Earton Pet Shop
Bonus: +100
Goat $56,500
Wjiskerton Pet Shop
Bonus:+110
Wallaby $65,00
Hotton Pet Shop
Bonus:+115
Chow Chow $66,000
Treeton Pet Shop
Bonus: +125
Dalmatian $66,000
Shellton Pet Shop
Bonus: +125
Daschund $66,000
Whiskerton Pet Shop
Bonus: +125
Great Pyrenees $66,000
Treeton Pet Shop
Bonus: +125
Pomeranian $66,000
Shellton Pet Shop
Bonus: +125
Airedale $71,500
Hotton Pet Shop
Bonus: +125
Australian Shepherd $71,500
Appleton Pet Shop
Bonus: +125
Cocker Spaniel $71,500
Earton Pet Shop
Bonus: +125
Doberman Pinscher $71,500
Earton Pet Shop
Bonus: +125
Golden Retriever $71,500
Appleton Pet Shop
Bonus: +125
Rough Collie $71,500
Earton Pet Shop
Bonus: +125
Donkey $78,000
Appleton Pet Shop
Bonus: +125
Bay Foal $165,000
Jungle Isle Adoption Centre
Bonus: +150
Bay Blanket Foal $165,000
Horse Isle Adoption Centre
Bonus: +150
Black Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Blue Roan Foal $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Brown, Draft Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Brown, Miniature Foal $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Camel Calf $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Chestnut Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Cremello Foal $165,000
Jungle Isle Foal Adoption Centre
Bonus: +150
Cria $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Dun Foal $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Grey Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Leopard Spotted Foal $165,000
Jungle Isle Foal Adoption Centre
Bonus: +150
Overo Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Palomino Foal $165,000
Jungle Isle Foal Adoption Centre
Bonus: +150
Piebald Foal $165,000
Jungle Isle Foal Adoption Centre
Bonus: +150
Red Roan Foal $165,000
Jungle Isle Foal Adoption Centre
Bonus: +150
Strawberry Roan Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Tobiano Foal $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Tovero Foal $165,000
Desert isle Foal Adoption Centre
Bonus: +150
White Foal $165,000
Horse Isle Foal Adoption Centre
Bonus: +150
Zebra Foal $165,000
Desert Isle Foal Adoption Centre
Bonus: +150
Baby Dragon $50,500,000
Mythical Creature Adoption Centre (Lava Isle)
Bonus: +200
Phoenix $50,500,000
Mythical Creature Adoption Centre (Lava Isle)
Bonus: +200
