Can a relative sue because cocker spaniel got her dog pregnant when was the one that loose?

In most jurisdictions, the owner of a dog that escapes and mates with another dog is generally liable for the resulting pregnancy and any associated costs. This liability can arise under various legal theories, including negligence and strict liability.

1. Negligence: In negligence actions, the injured party must prove that the dog owner failed to take reasonable care to prevent the dog from escaping and mating. This can include failing to properly restrain the dog, such as by leaving it unattended in an unfenced yard or allowing it to roam freely without supervision.

2. Strict Liability: In some jurisdictions, dog owners may be held strictly liable for damages caused by their dogs, regardless of whether they were negligent. This means that the dog owner may be liable for the pregnancy even if they took reasonable precautions to prevent the escape and mating.

In your specific case, whether your relative can sue the owner of the cocker spaniel depends on the specific laws and regulations in your jurisdiction. It is advisable to consult with a local attorney who can assess the relevant laws and circumstances and advise on the likelihood of success in a potential lawsuit. Factors such as the respective owners' responsibilities in keeping their dogs contained and supervised, as well as any relevant local ordinances, may come into play.