The Doctor's Buggy Set #5986 was released 2003-2005. Included a black Silky Sullivan, Sleeping Cat, Sitting Dog, buggy, trunk and medical bag. Model looks the same as #5177, so this could be from overstock. On the 2005 Retired List.
The Kittens & Foals Play Set #5406 was released 2008-2009. It included the Lying Foal, Standing Foal, Trotting Foal, Sleeping Cat, Sitting Cat, Standing Cat, straw bed, fencing and a hay manger. On the 2009 Retired List.