Dr. Paola Advises on Dog's Ball Aggression

A dog owner has sought advice from veterinarian Dr. Paola Cuevas after her pet displayed aggression over tennis balls at the park. The dog, a two-year-old cattle dog mix named Levi, goes after other dogs that try to take the ball he has chosen.

Dr. Paola, writing in the "Ask Dr. Paola" series for Dogster, identifies the behavior as resource guarding of a toy. She explains that Levi has learned that aggressive actions successfully protect his prized possession. "Think of it like someone repeatedly taking your favorite seat at the theater; eventually, you may start defending it before they even sit down," she writes.

Immediate Management Steps

The first and most critical step is to stop taking Levi to dog parks where loose tennis balls are available. Dr. Paola states this is not giving in, but preventing the dog from repeatedly practicing and reinforcing the undesirable behavior. Every successful guarding incident makes the behavior more entrenched.

Ball play should now occur only in controlled, private settings where no other dog can approach. The veterinarian also advises against confronting Levi by taking the ball away by force or scolding him, as this can increase his arousal and potentially worsen the guarding.

Implementing Positive Reinforcement Training

At home, the owner should begin training a positive "trade" or "drop" cue. This process starts with toys Levi considers low-value. The owner offers a highly desirable treat, gives a cue like "drop,"and rewards him immediately upon releasing the toy. The goal is to teach Levi that relinquishing an object leads to a worthwhile payoff, not conflict."play roughly" at home is not necessarily a problem. However, she recommends caution with high-arousal play around valued toys, as excitement can impair a dog's decision-making and response to social signals.

She advises giving Levi and Ruby separate opportunities for ball play. High-value toys should be removed when the owner cannot actively supervise their interactions.

Seeking Professional Help

Because Levi is already directing aggression toward other dogs, Dr. Paola suggests the owner consider consulting a veterinary behaviorist or professional trainer. This is particularly important if Levi has caused an injury, if his behavior is escalating, or if the owner cannot reliably prevent problematic encounters.

Dr. Paola concludes her advice by noting that while Levi's cattle dog heritage may contribute to a motivation for controlling movement and resources, genetics alone do not explain the behavior. The response is part of her weekly series providing expert guidance on dog care and behavior.