Garrett, a cocker spaniel owned by Lorelei Purdy of Minnesota, takes one of the jumps during the trials event at the Bonjon Shepherd Ranch in north Tampa. The AKC National Agility Championship starts today at the Tampa Convention Center and ends Sunday. The Agility Championship, as well as the AKC/Eukanuba National Championship and the AKC National Obedience Invitational, will be held concurrently this weekend at the Convention Center and the St. Pete Times Forum. Adult admission for the two-day championship is $25, $20 for seniors and $10 for children (free for children under 2). One-day tickets are $18, $15 and $5. Each day's ticket is good for admission to both venues. Call 301-2500.