Horses
Zelig would be a heavy set, dapple grey Gypsy Cob.
Charlie Skinner would be a chestnut Andalusion, or full blown Arabian with some warmer blood in there somewhere for musculature.
Coraa would be a dun warmblood mare.

Zelig (young) http://www.truebluegc.com/Images/NajmarFoal09.gif
Zelig (grown) http://www.parnellsirishcobs.com/images/dunbrody3.jpg
Charlie (young) http://www.knrarabians.com/harry-trot.jpg
Charlie (grown) http://www.savannahbloodstock.com/images/khadraj-004.jpg
Coraa (young) http://www.butleighponies.com/images/bballerina071.jpg
Coraa (grown) http://www.morgancolors.com/carrierear505.jpg

Dogs
Zelig would be a grey Norwegian Elkhound
Charlie Skinner would be a New Guinea Singing Dog
Coraa would be a light yellow/beige Saluki

Zelig (young) http://www.pupcity.com/images/adpics/06089092429342_1.jpg
Zelig (grown) http://www.petforums.co.uk/resources/images/thumb/0/01/Norwegian-Elkhound.jpg/350px-Norwegian-Elkhound.jpg
Charlie (young) http://newguinea-singing-dog-conservation.org/Images/RescuedPup.jpg
Charlie (grown) http://www.kostich.com/New%20Guinea%20Singing%20Dog07.jpg
Coraa (young) http://www.dogbreedinfo.com/images6/SalukiPUPPYmaysaasleepy2.jpg
Coraa (grown) http://dogbreedswiki.com/images/dogst/Saluki2.jpg

Rodents
Zelig would be Canadian Beaver
Charlie would be a Black Rat, or Ship Rat
Coraa would be a doormouse

Zelig http://animals.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/animals/images/800/beaver.jpg
Charlie http://www.icpetportraits.com/wildlife/black_rat_large.jpg
Coraa http://dizzigirl.files.wordpress.com/2009/02/dreamy-doormouse.jpg


You betcha it's a WIP =P