Try to work with tables, they're more versatile. Also check groupfilter for more advanced filtering schemes.
tab = array2table(string(yourCell))
cat1 cat2 cat3
______ ____ ____
"cat" 4 100
"dog" 4 100
"bird" 4 100
"cat" 5 100
"dog" 4 200
"cat" 5 100
idx = tab.cat1 == "cat" & tab.cat3 == 100;
newTab = tab(idx, :)
cat1 cat2 cat3
_____ ____ ____
"cat" 4 100
"cat" 5 100
"cat" 5 100
