The total ratio for the number of cats and dogs that Heloise has is 10+17 = <<10+17=27>>27
From the ratios, the fraction representing the number of dogs is 10/27, and this represents 10/27*189 = <<10/27*189=70>>70 dogs.
If Heloise gives 10 of her dogs to Janet, she remains with 70-10 = <<70-10=60>>60 dogs.
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