Hi Melissa Unless he's getting really dirty (ie playing in the mud, rolling in stuff that smells bad etc. etc.) then he really doesn't need bathing very often.
Rotties do need regular grooming in terms of brushing (they are shedders for sure!) and getting him used to this early on is a good idea. But a bath is only necessary once every couple of months or so.
This breed does have a tendency towards canine allergies so be sure to use a very mild shampoo especially for puppies or dogs with sensitive skin. Also rinse the shampoo out really well and dry gently.
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