If he's dry heaving I would at least reach an on call or emergency vet to ask what they think. I've heard that some bowl cleaners can be toxic. Here is a number I was given here last week when my dog got hold of a roach bait, it's Animal Poison Control. 1 888 426 4435. Please let us know what they say and how he does, and I hope he's OK.
Jennie, Gary & our kids:
cat colony: Hunter S Tomcat, Archie and Mehitable, Witch, and Calamity Jane, Cuddlebug, Havana, Ghost, Spitfire Liz, Little Bit, Jesse, Moe, Cali, Stardust, Anastasia & Christy, Sally and the 5 boys
dog pack Heinz and Heidi
rip Tiger, Rabbit, Two Stars, Angel,Elaine, Mungo Jerry, Tex and Ijimus. I'll meet y'all at the bridge.