What are the snuggle bed sizes?

SMALL

55 x 65 x 20cm (21.5 x 26 x 8")
Center mattress measures 45 x 55cm (18 x 22")
Cave opening is 40cm (16”) high from floor
Best for cats and dogs up to 10kg (22 lb)

MEDIUM

75 x 85 x 25cm (29.5 x 33.5 x 10")
Center mattress measures 65 x 75cm (26 x 30")
Cave opening is 55cm (22”) high from floor
Best for dogs up to 20kg (44 lb)

LARGE 

75 x 105 x 30cm (29.5 x 41.5 x 12")
Center mattress measures 65 x 95cm (26 x 37.5")
Cave opening is 65cm (26”) high from floor 
Best for dogs up to 40kg (88 lb)

More sizing information here