^ as a previous sheltie owner I honestly think it depends on how your sheltie is. Especally if he/she is shy then it would take longer to introduce them, It would also be a good idea to work on the jealousy aspect of an introduction. The top dog bit can be a pile of .. to put it nicely Twoddle.
If you are the alpha then BOTH dogs should behave if you dont accomidate for bad behaviour
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Many studies suggest that "NO!" even in a gruff/mean voice still encourages dogs to continue their behavior.
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and believe it or not .. ear biting. "I bite your ear im bigger than you." You might look stupid.. but it works.
It isnt that the dog is a czech, but the problems with hirarchy.