Snail Bites were a brand of snail treats that only appeared in the episode, "Treats!"
Snail Bites are a brand of treats that are addictive to snails. Snails would do anything to get a Snail Bite. They are manufactured by the Snail Bites Factory. They later were sold out due to many people buying them for their snails.
Role in the episode
SpongeBob first sees them on a commercial at work. He then bought them and brought them home for Gary. Gary was instantly addicted to them, and he liked them so much that when he had eaten enough, SpongeBob made him do tricks for them. After Gary ate the whole box in one day, he started meowing like crazy for more. SpongeBob couldn't sleep, so he went to his local pet store and they were all sold out.
SpongeBob then went to every pet store in the ocean to look for more Snail Bites, but none had them, as they were all sold out. Because he could not find them in pet stores, SpongeBob went to the factory where snail bites were made to see if they had some. They did not have any, and SpongeBob explained to Gary that there were no more snail bites and that there never would be. Consequently, Gary didn't stop meowing. SpongeBob looked to Patrick for advice, and he told SpongeBob that he needed to say "no" to Gary. SpongeBob tried this and Gary stopped meowing immediately. At the end Patrick was eating the last known box of Snail Bites and, after they were all gone, Patrick started acting like Gary.
Snail Bites are extreme addictive to snails (and Patrick Star- their effects on other inhabitants of Bikini Bottom are unknown.) just like of how Krabby Patties are addictive to Bikini Bottomites.
Snail Bites also seem to be filled with ingredients like catnip, a plant that attracts cats.
After a snail tastes one or two, they'll ask the owner many times for more.