Sims 3 Pets Glitch?

im having the same problem, i dont know what a graphics card is or owt but i have sims 3 fast lane, late night and i got pets today and installed it but when i went into create a sim i made a family and two horses and when i tried to make a dog it was all solid malti coloured, but i went into gameplay thinking it would be okay and my dog was still malti coloured so i thought, well i dont want a wierd dog and got my sims phone out and put up for adoption. when i looked back at my dog it was a deformed monster, it scared the life out of me, everything else is fine and the only other glitch i have ever had is with my sims, i cannot make my sims fat or skinny because they just get big gaps in their bodies, they go normal but only when i close my laptop and open it, but i have never really minded, but could this be related to this problem. i have done the first thing you said to do but i am too scared to go back on my game because the deformed creature is actually scaring me! its a real downer because i love sims 3 and was planning to get another expansion pack but at this rate i wont be even going on my game again ☹️ also i was planning on making a movie with sims 3 about this horse, im 13 and i write stories but really wanted to make a movie about a horse i writ a story about but now im scared its going to happen to my horses too, i havent checked cats yet.