mos you

[flyfish]

19a+7d suggests that the ball must always lands on zero
26a +6d caution around dogs & cats (4-2-2-4)
your help please

[Lie-in King]

19a & 7d Never odd or even
26a & 6d Step on no pets

I know that you're looking for a palindrome, but it would be nice if you post the full clues, numbers of letters & any you've placed, so that people without the puzzle can more readily help - thanks! :-)

[flyfish]

thanks very much

[the old mill]

Many thanks.