Yeah being a dog would have made it worse! My dauschunds would be trying to kill the Alien for just having looked at me. And yeah they wouldn't have succeeded but little dogs don't have concept of what is bigger and deadlier than them. Especially sassy dogs.
And my labrador would be trying to make friends with the Alien, intrigued about who this new animal was and could it perhaps play with her.
Can only imagine if the crew had dogs on board the situation would have been even worse!