Reynolds, who owns Nor Cal K9, is also accused of abusing or neglecting 6 other dogs.
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An Antioch code enforcement officer testified he found lots of feces and dog hair on this property, which he described in poor condition. Bridgett Loughnane testified she found a burn mark on her dog's Finley's neck, which she says Reynolds dismissed as a hot spot.
EXCLUSIVE: Two dog deaths spark concern about lack of regulations for dog trainers
But defense attorney Matt Fregi said Reynolds moved out of the property a month before Finley and five other dogs in the case were found there by authorities.
"The utter lack of there being other evidence of any wrongdoing on the part of Mr. Reynolds, especially as it relates to the passing of Gunnar, that is an absolute failure of proof," Fregi said.
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Prosecutors originally charged Reynolds with eight felonies, but recently dropped one of the charges.
The trial is expected to last into next week.
Take a look at more stories and videos by Michael Finney and 7 On Your Side.