It will be 2 weeks on Sunday that I adopted a Yorkshire Terrier and is 7 months old now. He was owner surrendered with his brother and was told there was sibling rivalry. He has done great at my house and been really sweet. I brought him to my mom's yesterday and got along great with her older terrior mix. Today my puppy and I went a couple places then back to my mom's house. He growled and started to attack her terrior on 2 occasions. He sounded horrible and showed his teeth – although once involved food but not sure what happened the first time unless he was guarding me. Since we got home he has been sleeping and was clearly probably extremely tired but concerned he may have aggression problems. We were shocked at his behavior because he had been fine and seemed to like her dog. I have never had a dog with aggression issues and don't know what to do.
submitted by /u/belowsnow
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