This section is from the book "Sporting Dogs. Their Points And Management In Health, And Disease", by Frank Townend Barton. Also available from Amazon: Sporting Dogs; Their Points and Management in Health and Disease.
It is very common to find the length of the claws so excessive that the resulting overgrowth penetrates the soft structures, causing the part to suppurate, and the dog lameness.
Clip off the offending part with a sharp pair of nippers. As a rule, nothing further is required.