
This is just some general advice but if you have worries always go to your vets.
Westies do not generally need high protien diets, they do well on things like Tripe and terrier biscuit, Mince, chicken and some veggies etc you can buy the meats prepacked even at some of the pet stores. If you have to feed a complete food I would suggest the small bites by Burns.
Keep the hair between the pads as short as possible and check for anything in the pads such as grass mites.
Try not to let them be on the grass all the time.
Pam