What happened to Rover? Do we see Blue after..

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the episode where Ike has his heart attack? I know Drew is told he can ride him when Elizabeth has her horse. I do not remember hearing about him past that point.

The last time I remember seeing Rover is when GW comes to pickup Erin for something. 

Seems that Judy, Elizabeth's pony, goes missing as well. 

There must be some black hole that eats Walton children and animals. 

[Brenda]

It does seem as though Judy the pony disappeared after that one episode. Kami says she hardly remembers the pony at all. This is what she posted on Facebook awhile back in response to someone’s question.

“One would think a pony and a pony cart would be more memorable, but I don't really have any specific recollections about the pony. Someone commented about how sad it was to watch Amy with the Pony, and Elizabeth watching from her wheelchair-- in that moment I remembered there was a scene with a pony! Looking at photos of the Baldwin Ladies bringing the pony and Rachel on the on the pony, nothing comes back to me. I wonder if I was in school for a lot of that? By law, I was supposed to accumulate 3 hours of school everyday, and as I look at The Ordeal, I wonder how that happened. I'm in a lot of scenes... It's possible that they sent me off to school every minute I wasn't on camera, so I wasn't on set watching the pony. This photo of Rachel loading me onto the pony cart did trigger a memory of how hard that was, since my legs were locked straight in the braces. There were a few things I was supposed to do in the script, come down stairs, sit on a swing, get into a pony cart that were almost impossible to actually do with leg braces. I remember being directed to do these things, trying during rehearsal and everything coming to a pause as I had no idea HOW. Then Larry would come over and we'd puzzle through the seemingly simple action... I remember that, but not much about the pony.

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Rover shows up (at least his voice) in season 8, the one with the teacher that is sick, that Elizabeth likes. 

I am thinking that Blue is actually last seen in the heart attack episode.