How can i make this photo please?

I have found this photo online and want to do the same thing with 2 photos of westie which sadly recently passed away. What photo app would it be or who could do it for me? Thanks

https://www.google.co.uk/search?q=toby+westie&client=ms-android-samsung&source=android-browser&dcr=0&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjvzO-vl-jXAhVKC8AKHdkrArEQ_AUICSgB&biw=360&bih=512#imgrc=_O9pqpV86MLp-M:

I generally utilise GIMP.

https://www.gimp.org/

It depends on what end result you want... I installed ''Snipping tool'' / You can draw a square around anything you have on screen and save it.