Honestly, I'd go back to feeding what you were feeding before the paw chewing started -- to really see if it's the new food or not. Granted, Ceasers is not a great food - but if there was no paw chewing then, it'd be fine to try it again for 6 weeks and see what happens. If the paw chewing disappears, then you know something for sure.
I wouldn't switch to just another protein source w/in the same brand bc they will use very similar ingredients overall within the brand...so it is very possible you won't get anything out of switching.
Read more here about how to approach allergies:
http://www.yorkietalk.com/forums/die...tart-here.html