My Chihuahua is 9 months old and is in heat. I know that chihuahua's shake alot but she hasn't shaken like this before and I'm just a little curious if it's because she is in heat?

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Not sure if it's an always thing but mine did the exact same thing her first time in heat. I know she wasn't cold because it was in Texas during the summer :) She shook a lot and got extremely cuddle-y and sweet, which was odd because normally she is hyperactive and only cuddled when she was exhausted.