i have a 4yr old kelpie cross which i rescued from the pound, she had been rescued by them because she was abused at first she was very timid but slowly came around, we got another pup 12-18 mths after that, for a bit of company (both Female) and they have been getting along fine for the last 12 months but recently the pup is starting to growl and nip at the older more timid dog, they are both approx the same size and weight. Any suggestions to the reason for this and should we look at moving the pup to my sisters place for an extended holiday before they hurt each other?