I had a dog who died of heart worms a few years back used to do that all the time. Prop her head up agenst the wall, it was so cute. She did it right until I sat down in the same room as her and she would put herself right at my feet. I miss my dog too. The part that makes me the most mad about it is my father had told me that he got her the medication for her but lied about it. Not to mention I was not living with him for like, three months at this time. So I didn't get to see her before she died.