Is it because it is Warm? Why Stretching against legs?

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    Here is Questions fromΒ Katherine Mcneil : Is it because it is Warm? Why Stretching against legs?

    “I have 2 Bostons and a chocolate Lab and I have never seen anything like it before. The Bostons will sit on or lay on the Lab every chance they get.

    My question is, is it because he is warm? Also they both streach while standing up against my leg?”