What could possibly go wrong?
![](https://scontent-lax3-1.xx.fbcdn.net/hphotos-xtp1/t31.0-8/11145024_10204550332699236_8637440122545546062_o.jpg)
Is this a "service dog" in the making?
![](https://scontent-lax1-1.xx.fbcdn.net/hphotos-xfa1/v/t1.0-9/11813460_622068637896577_5365942848731330356_n.jpg?oh=8c38a639b66821632ae7cef0778cdd64&oe=56562F79)
![](https://scontent-lax3-1.xx.fbcdn.net/hphotos-xtp1/t31.0-8/11145024_10204550332699236_8637440122545546062_o.jpg)
Is this a "service dog" in the making?
![](https://scontent-lax1-1.xx.fbcdn.net/hphotos-xfa1/v/t1.0-9/11813460_622068637896577_5365942848731330356_n.jpg?oh=8c38a639b66821632ae7cef0778cdd64&oe=56562F79)
"He's actually pretty gentle when he bites him in the sleeve," Grennan says of Hulk's training sessions with his son. "He almost doesn't want to."
This is what a "pretty gentle" looking dog looks like.
![](https://scontent-lax1-1.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/s600x600/11053116_766750073438727_7028899185448974981_n.jpg?oh=4465be2e03262accaa03a1ea76b250fc&oe=564A1EC5)