Taro, you is spanish yes?
give one look in this site
www.lobourbano.com
About pig meat, i not see problems if the pig are the same meat use for the humans, they have one rigorous control for these problems.
Mad cow not give problems for humans, but all cows and cows that live in the local infected are sacrifiqued for not pass this sick for other animals.
If you give the similar meat the you buy for you for the dog, not go have problems.
greetings
Paula H.Pandolfo