Yes you can but your vet has to order it and usually they are done at vet schools or state laboratory. Fees are based on the size of dog. The dog would need to be frozen immediately upon death to be viable. Call any vet in your area.
in general, there could be two realistic answers to this.
The first as a joke ... none, dogs don't have feet they have paws.
The second answer forgiving the feet/paw issue and presuming you meant...
Aggression is a very strong word in the dog language. There are very few cases where a pooch shows any TRUE aggression. When they do however, it depends on the situation or place they are in or at....