HOUSTON – A Katy grandfather is searching for answers after he said he found a dead rodent inside his grandson’s bottle of Dr Pepper.

John Graves of Katy said his 3-year-old grandson, Kayden, drank the Dr Pepper on Sunday after they bought it in Galveston. The boy was given the soft drink while he sat in his car seat. He didn’t finish it, so they put the cap back on.

When they opened the 20-ounce bottle the next morning, they found a rodent floating inside. “Pretty good size. About 3 inches long, with a big tail,” Graves said.

They immediately took Kayden to his pediatrician to undergo some tests. Blood and urine samples were taken, and the state of Texas and the Centers for Disease Control were contact. They are now waiting for the results.

Fortunately so far Kayden appears happy and healthy. “I’m concerned about the health of my grandson,” Graves said.

The family also contacted Dr Pepper. A spokesperson told them and KPRC 2 that they want the bottle so they can run tests on it.

But the Graves family wants to have its own testing done before handing the bottle over to Dr Pepper's people.

"I want to get the rat tested to see where it came from, how it got there, if there is any medical concerns we should be concerned about," Graves said. “There is no telling what could happen to that sample.”

As of Tuesday, the family was working with Dr Pepper to figure out if the rodent could be sent to an independent lab in Houston. Dr Pepper tells Channel 2 it would be happy to send the rodent to a qualified lab in Texas; however, at this point the only qualified lab the company is aware of is Alteca LTD in Kansas.

The family told KPRC 2 it may contact a lawyer and will work with Dr Pepper to figure out what the next steps are.

"A mouse can fit through a hole about the size of a nickel." -UH food safety expert @KPRC2 @drpepper pic.twitter.com/XA0uewXNny — Samantha Ptashkin (@SamPtashkin) May 10, 2016

The owner of the Galveston store where the soda was bought told Channel 2 that all of its bottles come sealed -- and if anything was inside, it came from the manufacturer.

But a Dr Pepper spokesperson says it's virtually impossible for something to get into one of its bottles.

Dr Pepper-Snapple released a statement to KPRC 2 News that read:

"Nothing is more important to us than the safety and well-being of our consumers. We take all consumer complaints very seriously, are very concerned about the call we received today from Mr. Graves and are investigating it as best as we can.

"What we know from our experience is that given the controls and safeguards we have in our production facilities it is virtually impossible for any foreign object to enter any container during the bottling process. All of our containers enter our facility on pallets in our warehouse and remain covered until the moment they are placed on our high-speed filling lines. Once on the filling lines, they are inverted and rinsed out before they are filled and capped.

"We have offered to dispatch a courier to pick up the product to take it out for testing by a third-party forensics laboratory, but the consumer has declined this request. This lab would be able to analyze any rodent that got into the product, determine how it entered the container and even inspect the contents of its stomach. This process can take 6-8 weeks to yield conclusive findings. Until we have the opportunity to review the contents, we don't have a way to do a full investigation."

Jay Neal, a food and safety expert at the University of Houston, said while it is not probable for a rodent to end up in a bottle at Dr Pepper’s packaging facility, it is possible. “A mouse can fit through a hole about the size of a nickel,” Neal said. “They don’t have bones, they have cartilage, and they can squeeze through it.”

He said it’s not common for consumers to see something like this in a product because of so many checks and balances in the system, and due to the speed at which products are packaged. “It’s washing the bottle, it’s filling the bottle, it’s putting the cap on the bottle, it’s putting the label on the bottle, all in less than 15 seconds,” Neal said.

Following up with fam who found rodent in @drpepper . Grandfather wants to get the rodent tested for disease @KPRC2 pic.twitter.com/2SyEqOVz25 — Samantha Ptashkin (@SamPtashkin) May 10, 2016