Doberman Mini Pinscher Dogs

Problem with my pets (dog, cat Abd )…. Help?
My neighbor gave me that little cat (I have even seen when he was born ….[ disgusting ... you do not Know]) Well … To return this kitten knows me since he came to life now He is 5 months and my dog (female, miniature [mini Doberman]) since he knows two months for them to know other dogs pretty well.My love my kitten, nugget.She hurt to play with my little toddler him.Oh and is 1 year old.She cat.But fun with! Nugget I do not know what he has in mind! My dog is outside and when I opened the door to get inside her, she goes to nugget and my cat acts ok … as normal .. but then he grabbed a leg of my princess and begins not hard. How do I know? my little girl gave a cry! So I do not know, I think he plays, but it takes seriously.What should I do? Help I want them to mean! This would be a dream come true! Thank you for your time! ♥
well you chat soon they have learned in the family if you bite someone theyll bite you back the same thing happened to me