I've heard that rats like yoghurt, I don't have any though.
Is cows milk from a saucer safe for them?
NB: They are
Rattus norvegicus (
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You can give rats a little milk as a treat, but I can see that getting a little messy being delivered in a saucer.
If you're looking to treat your rat, but you don't have any yoghurt then there are other things rats like.
Peas. Rats love eating peas. Mine will sit there quite happily peeling the skin off and eating the insides. Frozen peas make a great treat on a hot day.
Fruit makes for a tasty snack too. Banana slices either dried or fresh will get gobbled up in a flash. I like to feed mine the occasional honey coated banana chip as a treat or a reward for good behaviour.
Rats adore peanuts. You can buy bags of unshelled nuts and hand them out as treats. The rats will love cracking open the thin shells and digging the tasty peanuts out.
Supporting reference : Rat Forums
It is better to give them yogurt (but rather as a treat) than milk, because yogurt is usually fine for people (or animals) even those that are lactose intolerant.
Basically most mammals (including humans) lose the ability to digest lactose as adults. How much is OK depends on the individual.
Sometimes I give my rats some yogurt or some white cheese even without any diarrhoea related problems.