Does touching a fennec fox nullify one's ablution, and is it treated like dogs if it drinks from a vessel?

There is no evidence that touching an animal invalidates ablution (wudu').

If a fox drinks from a vessel, scholars have differed concerning its remnant (su'r). The more cautious approach is not to drink from it, nor to perform ablution with it. Instead, the water should be poured out and the vessel washed.