R.I.P. Fleetwood

On Monday my wife and I had to put one of our dogs down. Fleetwood, a fox hound was rescued by us 5 years ago from someone that was going to have to put him in a shelter due to a move. We took him into our home and warmed up to him immediately. He was one of the most well-behaved dogs I've ever had.

When my wife and I got home on Monday, we found that he would not use his hind legs at all. So we took him to an emergency clinic where we found that he had a herniated disc in is back. Our option was a surgery that ran from 3k-6k, with a less than 50% chance he would have the same quality of life ever again. It was the hardest decision I've ever faced, but in the end was probably the most humane.

The worst part is that Lola, our other dog ( 16 month old English bull-dog) is in a depression. She hasn't eaten much, played a lot, or has an interest in going outside. She has always been around dogs, and is not used to being alone. She went from being in a litter of six to coming home with us and being with Fleetwood. I feel so sad for her it kills me. My wife spoke to the breeder that we got our dog from stating that she was concerned about Lola's mental well-being. The breeder said she had a bull dog  that was just a month older than Lola, and hasn't been able to sell her. She asked us if we wanted her, and we both said we couldn't afford the 2000.00 it would cost to get her (we got a great deal on Lola). She said that we could have her free of charge.

So, my dilema is:

Do I honor Fleetwood's memory and not get a dog right away and allow myself the grieving process or:

Get the dog to ensure that Lola has a playmate and a companion.