<human>: In my head, it's already a yes. But I need help convincing my dad.

My mom died a few months ago and now I have to live with my dad, bringing my 15 year old yellow lab and my two cats.

My yellow lab was the runt of the litter. She is now the longest surviving dog from the litter. She is completely deaf, almost blind, has ears that often get very infected, and her joints pop and snap and she has a very difficult time standing up and down.

We had a dog bed at my mom's house but it got thrown away during the move. My dad believes dogs don't need dog beds because for thousands of years they were in the wild without them.  I'm young and don't have a job so I cant buy one myself. I feel so bad for my old puppy, it is obviously painful for her to get up and down and my dad doesn't care. She is forced to sleep in a small confined sunroom because my little brother (2 years old) tries to ride her and hit her, and the only place she can be is in that small room because she can't walk up stairs. She sleeps on the hardwood floor. I'm afraid she's going to break something when she tries to stand up while she slips and slides around and whines.

How do I convince my dad to invest in a dog bed?

Give me a shortened version of the text
<bot>: dad doesn't want to buy my 15 year old dog a dog bed and I need help convincing him to get one.