Our expert says:
Dog Behaviour Expert
Hi Elize, not having more background on the dogs it is often difficult to say why happening, but this behaviour does seems to occur more when a pup is taken away from its mother too young, normally around, or before 6 weeks of age, with some dogs sucking/chewing on other animals and some even sucking on blankets etc. Some animals grow out of it and if it is worrying you (or the other animals)try distraction by way of offering a nice chew toy such as a rawhide which has been 'laced' with some peanut butter in the cracks and even a few pieces of biltong. It is important to distract the dog before it really gets stuck in to sucking on the other dog.
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