The standard frame Albedo Miniature is heroic 28mm, compatible with WH40K Imperial Guard. We use this for cats, dogs, otters, ponies, badgers etc.
Small frame is 80% of that. We use that for rats, mice, shrews, moles etc.
Large frame is 120%. We use that for horses, bears, wolves etc.
Photo shows comparison large, standard ans small frame creatures.
www.acp164.com The Albedo Miniatures Game