It may be possible to charge someone with animal cruelty in the absence of direct evidence of any acts he did. It works like this: suppose it can be shown, such as with credible testimony, that on Saturday the dogs were fine (i.e. either no injuries or no life threatening injuries). The dogs were in your husband's care. Sometime during his care, when no one else had access to the dogs, a dog was injured or killed. If the dog had been fine, then when the only person with access to it was your husband, it suffered significant injuries; if there was no other way for those injuries to come about, that may be enough to establish your husband as the source of the injuries.