ok, that said, what i would suggest is to use a background of maybe an off brown color, not to light not to dark and just hang it up around the area you are going to shoot, in this case it is lifeform, and kinda still, you would use a backdrop. colors that you can also use would be a soft black, again not to dark not to light. then i would use a backlight behind the backdrop to "lighten up" the mood. Then i would get overstuffed blanket or pillow, dealing with sun is very very trickey, but, my father can capture sun moment like no other, i will have to get his website to show you some of his work. he does great. you are starting off good, just keep practicing, the thing with photography is if you make a mistake you can use always tints and colors ( like do a black and white with color) that always looks cool, like you could do your pup in BW and then add color to it.