An apparatus for cleaning an animal’s paw broadly comprises an elongated rigid cylindrical sidewall having an end wall and an open rim which substantially seals to an animal’s paw as the paw is withdrawn from the apparatus. The electrolyte solvent includes 1,3-dioxolane and 1,2-dimethoxyethan in a volume ratio greater than 45:55 and less than 85:15. Next, the lateral position of an edge point of the feature is predicted in dependence upon a particular resist development time, and further in dependence upon the image intensity values at more than one depth within the resist. If a message datagram is not acknowledged, the wireless communication device continues to retransmit the unsuccessfully transmitted message datagram at a retransmission rate based on a running average of acknowledgment times for successfully transmitted ones of the message datagrams. The first layer of material is a superelastic alloy having a relaxed configuration substantially in the staple’s second shape.