Dog, cat and hamster, for example? (7)
I believe the answer is:
whippet
'dog' is the definition.
(whippet is a kind of dog)
'cat and hamster for example?' is the wordplay.
'cat' becomes 'whip' (I've seen this before).
'and' says to put letters next to each other.
'hamster for example?' becomes 'pet' (hamsters are often kept as pets).
'whip'+'pet'='WHIPPET'
(Other definitions for whippet that I've seen before include "racing animal" , "Dog related to 9 down" , "Dog bred for racing" , "Racing-dog" , "Small greyhound-type dog" .)