Why has my sweet pup turned into a raging defender?

by Denise
(Aiken SC)

I bought my first shih tzu last year in May. I got a second one in December from the same breeder, same parents. At first all seem d to be fine. They play and rest together. At times they play fight and at times I get nervous because they seem so aggressive with one another. Recently the older one is snapping at people who approach him to pet him. (Before I got the other one, he would roll onto his belly for a rub.) I a, concerned because he has jumped up and snapped at two of my neighbors and even my 15 year old son.

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