
Hit Ctrl, Alt and C and type in testingcheatsenabled true.

SO, what do people do? A lot of people use cheats. Then you have to wait up to four days before there is a chance for them to come back and it might not even be the same stray that returns. Max visiting time of 2 sim hours is seriously short because before you can adopt a stray, you need to get them to beyond friend status! That means as soon as you see a stray, you have to run over and spam them with friendly interactions and more than likely they will leave before you get them past acquaintance.

The game by default only allows a town 5 stays max at any given time and other limitations, which make this difficult.

Adopting/finding a stray pet in Sims 3 Pets is rather difficult.
