Rescue Beagle & separation anxiety

[Westielvr]

A friend recently rescued a Beagle from the States. We don't know much about the background, the dog appears to be around 2 and spayed but so far, the Beagle appears friendly and happy.

The real problem is when my friend leaves the house and the dog is in a spacious laundry room (gated) the dog howls, urinates and knocks down the gate. She was told to crate the dog but the dog hurt it's nose by trying to get out and it is still healing.

Now, without a gate, the dog frequently urinates when they leave the house. Any recommendations or advice?

Thanks!