The basic abbreviations are:

Prefix:

AKC - American Kennel Club

UKC - United Kennel Club

CH - Champion (may clarify which registry)

GCH - Grand Champion (If there's another letter after the 'H' it's the level of Grand Championship the title is)

PACH or MACH - Agility Champion (and others)

HC - Herding Champion

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​Suffix:

First letter is R - Rally   O-Obedience   A-Agility  H-Herding
S-Scent Work
S-

ATT- Temperament test
THD - Therapy Dog
TK - Trick Dog
CGC, CGCA, CGCU - Canine Good Citizen

BCAT, DCAT, FCAT - Fastcat titles

When you see a N it usually means novice, O-open, A-advanced, E-excellent, M-Masters

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For a full list:

Titles & Abbreviations – American Kennel Club (akc.org)

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