Why does my dog swing his hind legs side to side when he's trotting?

asked 2017-04-03 13:17:04 -0600

I have a 3 1/2 year old dachshund-chihuahua mix. Whenever we got for a walk, he'll start swinging his legs. My friend has the same breed of dog who also does this. I'm wondering the cause for it and why dogs do it.

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